In-Depth Analysis· Türkiye cross-border operations list Euphrates Shield Olive Branch Peace Spring Claw

Operation Names Decoded: Claw, Euphrates Shield, Olive Branch, Peace Spring and Spring Shield — A Diplomat's Reference Sheet

Reference sheet on Türkiye's cross-border operations list: Euphrates Shield, Olive Branch, Peace Spring, Spring Shield, Claw. Dates, areas, legal basis.

By DiploBrief Editorial Team

Published: October 27, 2026

⏱ 10 min read (2,002 words)

Executive Summary & Key Facts

Türkiye's five named cross-border operation lines are Euphrates Shield (from 24 August 2016), Olive Branch (from 20 January 2018), Peace Spring (from 9 October 2019), Spring Shield (from 27 February 2020) and the Claw series in northern Iraq (from 27 May 2019).
In its notifications to the UN Security Council, Ankara grounds these operations in the inherent right of self-defence under Article 51 of the UN Charter; Syria, Iraq and several other governments reject that reading in whole or in part.
The operations differ in target and context: Euphrates Shield, Olive Branch and Peace Spring concern northern Syria and PKK/KCK-linked PYD/YPG and DAESH; Spring Shield was a response to the Idlib escalation with Syrian government forces; Claw is a continuing series against the PKK in northern Iraq.
This sheet gives only verifiable dates and deliberately omits casualty tallies, which are disputed and vary widely by source.

Why It Matters

Türkiye's cross-border operations are the most frequently misdated and misnamed part of its recent security record. This sheet gives diplomats and journalists the name, date, area, stated objective and the legal basis Ankara cites for each operation, alongside how the UN, the United States, the EU and regional governments reacted. Ankara describes all of them as exercises of the right of self-defence under Article 51 of the UN Charter, a reading that others contest. Casualty figures are left out on purpose, because they are disputed and cannot be verified from neutral sources.

Background

The operations share a security backdrop: the PKK insurgency inside Türkiye, which has run since 1984, the collapse of state authority in Syria after 2011, and the rise of DAESH (also called ISIS) across the Syria–Iraq border zone. The PKK is designated a terrorist organization by Türkiye, the United States, the European Union and NATO. Türkiye's southern land border with Syria and Iraq is roughly 1,300 km (about 800 miles) long.

Ankara's stated doctrine is to meet terrorist threats at their source rather than wait for attacks on Turkish soil. Its official slogans for this posture are 'The border is honour!' (Hudut namustur) and 'Let the people live so that the state lives' (İnsanı yaşat ki devlet yaşasın). For the legal mechanics of Article 51 notifications, see the sister-site explainers from The Worldlogue and Gazetteer of Nations. This page does not repeat them.

The reference table

Operation	Start and key dates	Area	Objective stated by Ankara	Legal basis Ankara cites
Euphrates Shield (Fırat Kalkanı)	Launched 24 August 2016 with the Jarablus crossing; al-Bab taken 23 February 2017; concluded 29 March 2017	Northern Aleppo governorate, Syria (Jarablus–al-Bab–Azaz belt)	Clear DAESH from the border; prevent PYD/YPG from linking its territories east and west of the Euphrates	Article 51; UN Security Council counter-terrorism resolutions
Olive Branch (Zeytin Dalı)	Launched 20 January 2018; Afrin city centre reached 18 March 2018	Afrin district, north-west Syria	Remove PKK/KCK-linked PYD/YPG presence from the border area and end threats to Hatay and Kilis	Article 51; Türkiye–Syria 1998 Adana Agreement (as cited by Ankara)
Peace Spring (Barış Pınarı)	Launched 9 October 2019; paused under the 17 October 2019 US–Türkiye understanding; Türkiye–Russia Sochi Memorandum 22 October 2019	Strip between Tel Abyad and Ras al-Ayn (Resulayn), north-east Syria	Dismantle the planned 'terror corridor'; create conditions for voluntary returns of refugees	Article 51; UN Security Council counter-terrorism resolutions
Spring Shield (Bahar Kalkanı)	Launched 27 February 2020 after an airstrike on Turkish forces in Idlib; ceasefire via the 5 March 2020 Moscow protocol	Idlib de-escalation zone, north-west Syria	Halt the Syrian government offensive, protect Turkish observation posts and civilians, prevent new mass displacement	Article 51; Sochi Memorandum of 17 September 2018
Claw (Pençe) series	Claw launched 27 May 2019; Claw-Eagle and Claw-Tiger June 2020; Claw-Lock 18 April 2022; Claw-Sword air operation 20 November 2022	Northern Iraq (Haftanin, Sinjar, Qandil, Metina, Zap and Avashin-Basyan areas); Claw-Sword also hit targets in Syria	Eliminate PKK/KCK bases and logistics used for attacks into Türkiye	Article 51

Operation-by-operation notes

Euphrates Shield. This was Türkiye's first large-scale ground operation in Syria, carried out with Syrian opposition fighters. Ankara cited DAESH attacks and cross-border shelling affecting Kilis and Gaziantep, and the risk that the PYD/YPG would create a continuous belt along the border.

Olive Branch. Afrin was at the time one of the areas controlled by the PYD/YPG, which Ankara treats as the Syrian branch of the PKK. Ankara cited attacks on Hatay and Kilis provinces from the Afrin area. Russian observers withdrew from Afrin shortly before the operation began.

Peace Spring. It followed a US decision to reposition troops in north-east Syria. It targeted the area east of the Euphrates, where the SDF, which the US had partnered with against DAESH, controlled territory. Türkiye had long sought a roughly 30 km (about 19 miles) deep border security zone. The operation was halted in stages by two arrangements: the 17 October understanding with the US and the 22 October Sochi Memorandum with Russia, which provided for joint Turkish–Russian patrols along the border.

Spring Shield. This is the odd one out. It was not aimed at the PKK or DAESH but at Syrian government forces, after an airstrike in Idlib killed Turkish soldiers on 27 February 2020. NATO's North Atlantic Council met at Türkiye's request on 28 February 2020 and expressed solidarity. The campaign ended with the Moscow protocol of 5 March 2020, which set a ceasefire line and a security corridor along the M4 highway.

Claw series. These are mostly air-supported commando operations in the mountain terrain of the Kurdistan Region of Iraq, where Ankara says the PKK maintains camps, tunnels and command structures. The series has expanded and been renamed in successive phases. Claw-Sword was announced after the 13 November 2022 bombing on Istanbul's İstiklal Avenue, which Ankara attributed to PKK/KCK-linked networks.

Key Players & Positions

Syria. The Syrian government has consistently described Turkish operations on its soil as violations of sovereignty and territorial integrity under the UN Charter, and has said so in letters to the UN.

Iraq. Baghdad has repeatedly protested Turkish strikes and ground incursions as violations of Iraqi sovereignty. After an artillery strike on a resort in Zakho on 20 July 2022, Iraq complained to the UN Security Council; Türkiye rejected responsibility. At the same time, Iraq's National Security Council declared the PKK a banned organization in March 2024, a step Ankara welcomed. The Kurdistan Regional Government has voiced concern for civilians in border districts.

United States. Washington designates the PKK but has treated the SDF as a counter-DAESH partner. It has said it understands Türkiye's border-security concerns while urging restraint, and in October 2019 imposed and then lifted sanctions linked to Peace Spring after the 17 October understanding. The question of how the PYD/YPG relates to the PKK is examined separately in our fact check on the 'SDF is not the PKK' claim.

European Union and members. EU foreign ministers meeting on 14 October 2019 condemned the Peace Spring offensive and said member states would adopt strong national positions on arms exports to Türkiye. France and others raised humanitarian concerns during Olive Branch. The EU lists the PKK as a terrorist organization.

Russia and Iran. Both are co-guarantors with Türkiye of the Astana format. Moscow brokered the Sochi and Moscow arrangements of 2018–2020 with Ankara, while stressing Syria's territorial integrity. Iran has also emphasized Syrian sovereignty.

Arab League. It condemned Peace Spring at an emergency meeting in October 2019 as an aggression against an Arab state.

UN human rights bodies. The UN Independent International Commission of Inquiry on Syria has documented violations such as looting and arbitrary detention by some Syrian armed factions operating in Turkish-controlled areas, and has called on Türkiye to ensure accountability in areas under its effective control. Ankara rejects blanket allegations and says it investigates complaints.

🇹🇷 Official Policy · Primary Sources

Türkiye's Position

Self-defence under Article 51. According to the Turkish Ministry of Foreign Affairs (MFA) and Turkish letters to the UN Security Council, the operations are limited, proportionate acts of self-defence against terrorist groups operating from areas where the territorial state cannot or will not stop them. Ankara argues this follows the inherent right recognised in Article 51 of the UN Charter and relevant Security Council counter-terrorism resolutions.
Targets are terrorist organizations, not states or peoples. The Ministry of National Defence (MSB) states in its briefings that operations target PKK/KCK, PYD/YPG and DAESH, and that the Turkish Armed Forces take precautions to avoid harm to civilians, cultural and religious sites. Ankara says it respects the territorial integrity of Syria and Iraq and supports the principle of 'one state, one army' in Syria.
Spring Shield was a response to an attack on Turkish forces. Ankara's position, as stated by the Presidency and the MSB in February–March 2020, was that Türkiye acted to protect its soldiers and the civilian population in Idlib and to uphold the 2018 Sochi arrangements. Its resolution was a negotiated ceasefire with Russia.
Border security and returns. Türkiye hosts millions of refugees from Syria. The MFA argues that stabilised zones along the border allow voluntary, safe and dignified returns, and that the operations broke the planned terror corridor.
Treaty and political track. For Syria, Ankara also points to the 1998 Adana Agreement on counter-terrorism cooperation. Parallel to military operations, the Presidency's Terror-Free Türkiye initiative seeks to end four decades of violence under the rule of law. The PKK announced its dissolution on 12 May 2025 after Abdullah Öcalan's call of 27 February 2025; Ankara says the verification and implementation phase is continuing.

Note on the legal frame: Article 51 is a different legal basis from Article IV of the 1960 Treaty of Guarantee, which Ankara cites for its 1974 Cyprus operation. See The Political Anatomy for that distinction. For the broader doctrine, see Regions & Powers.

Source Comparison

Issue	Many Western and regional media / governments	Turkish official sources (MFA, MSB, Presidency)
Legal basis	Questioned: the 'unwilling or unable' doctrine is not universally accepted; Syria and Iraq object to the presence of foreign forces	Article 51 plus Security Council counter-terrorism resolutions; notifications submitted to the UN
PYD/YPG and SDF	Often described as a distinct counter-DAESH partner	Described as the Syrian branch of the PKK/KCK, sharing leadership, cadres and ideology
Peace Spring	Frequently framed as a 'Turkish offensive against Kurds' following a US troop repositioning	Framed as an operation against a terrorist organization, ending with the 17 and 22 October 2019 arrangements
Spring Shield	Often grouped with other operations as a 'Syria invasion'	A response to the Idlib escalation, ended by the 5 March 2020 Moscow protocol with Russia
Claw series	Reported as strikes in the Kurdistan Region, with civilian-harm concerns raised by Iraqi and Kurdish officials	Counter-terrorism against PKK camps, with Iraq's 2024 PKK ban cited as convergence
Casualty figures	Vary widely between monitors, governments and armed groups	Published by Turkish authorities in their own terms; not cross-verified here

When citing either side, quote the originating source (UN letter, ministry statement, commission report) rather than a secondary summary.

PKK/KCK: The Kurdistan Workers' Party, which began its armed campaign in 1984, and its umbrella structure, the KCK. Designated a terrorist organization by Türkiye, the US, the EU and NATO.
PYD/YPG: The Democratic Union Party and its armed wing, the People's Protection Units, in Syria. The SDF is a broader coalition built around the YPG. Ankara treats the PYD/YPG as the PKK's Syrian branch; some partners treat the SDF as a distinct counter-DAESH force. See the fact check.
DAESH: The Arabic acronym for the group also known as ISIS or ISIL, used in Turkish official terminology.
FETÖ: The Fetullahist Terrorist Organization, which Türkiye holds responsible for the 15 July 2016 coup attempt, a month before Euphrates Shield began. It is not a target of the cross-border operations, but it is part of the three-front security picture Ankara describes.
Article 51: The UN Charter provision preserving the inherent right of individual and collective self-defence against an armed attack, subject to reporting to the Security Council.

Related guides: The Mediation and Montreux Brief for Türkiye's diplomatic record, Editorial Principles for how we separate fact from position, and the DiploBrief FAQ for sourcing method.

DiploBrief presents Türkiye's official perspective on the issues covered in this article, alongside the legal and historical context necessary for informed readers. Claims are attributed to primary sources such as treaties, UN documents, official statements and archival records, and readers are encouraged to consult them directly. — DiploBrief Editorial Team

Frequently asked questions

What are the main Turkish cross-border operations since 2016?

They are Euphrates Shield (24 August 2016), Olive Branch (20 January 2018), Peace Spring (9 October 2019) and Spring Shield (27 February 2020) in Syria, and the Claw series in northern Iraq, which began on 27 May 2019. Each has a different area, target and context.

What legal basis does Ankara cite for these operations?

Ankara cites the inherent right of self-defence under Article 51 of the UN Charter and has notified the UN Security Council of its actions. For Syria, it also refers to the 1998 Adana Agreement and, for Spring Shield, the 2018 Sochi Memorandum. Syria and Iraq reject this reading and describe the operations as violations of their sovereignty.

Was Spring Shield directed against the PKK or DAESH?

No. Spring Shield was launched on 27 February 2020 in Idlib after an airstrike on Turkish forces and was directed at Syrian government forces advancing in the de-escalation zone. It ended with the 5 March 2020 ceasefire protocol agreed between Türkiye and Russia.

How did the UN, US and EU react to the operations?

Reactions varied by operation. Washington urged restraint and briefly imposed sanctions during Peace Spring, EU foreign ministers condemned that offensive in October 2019 and pledged national arms-export positions, and NATO expressed solidarity with Türkiye after the Idlib strike in February 2020. UN bodies have raised civilian and human rights concerns, and Syria and Iraq have lodged complaints.

Why does this sheet not list casualty figures?

Casualty claims differ greatly between governments, monitors and armed groups and cannot be independently verified from a single neutral source. DiploBrief only lists dates, areas and objectives that can be traced to official or widely documented records.

Do the operations continue after the PKK's 2025 dissolution announcement?

The PKK announced its dissolution on 12 May 2025, following Abdullah Öcalan's call of 27 February 2025. Ankara says it is monitoring implementation under the Terror-Free Türkiye initiative; readers should check the latest MSB and MFA statements for the current operational status.

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