Five Operation Names, One Doctrine: A Document-Based Guide to Claw, Euphrates Shield, Olive Branch, Peace Spring and Spring Shield

Why It Matters

Türkiye has conducted four named cross-border operations in northern Syria (Euphrates Shield 2016, Olive Branch 2018, Peace Spring 2019, Spring Shield 2020) and a continuing series of Claw operations in northern Iraq since 2019. Ankara describes all of them as counter-terrorism measures taken in self-defense under Article 51 of the UN Charter. Other governments accept, contest or qualify that framing. This guide is an operational reference: dates, stated objectives, the legal basis Ankara cites, and who said what.

For the legal analysis of Article 51 itself, see the sister-site studies at PolitiLine and Gazetteer of Nations. This page does not repeat them.

Background

The operations follow decades of PKK violence and, after 2011, the collapse of central authority along Türkiye's roughly 1,300 km (about 800 miles) of southern border with Syria and Iraq. The PKK (Kurdistan Workers' Party) began its armed campaign in 1984. It is designated a terrorist organization by Türkiye, the United States, NATO and the European Union. Its umbrella structure is called the KCK. The PYD and its armed wing, the YPG, emerged in Syria; Ankara regards them as the PKK/KCK's Syrian branch. The YPG became the core of the Syrian Democratic Forces (SDF), which the US-led coalition partnered with against DAESH (ISIS) from 2014–2015.

Operation reference table

How the legal notifications work

Article 51 requires states to report measures taken in self-defense to the UN Security Council immediately. Türkiye has submitted letters to the Council president and Secretary-General around its operations, and the Turkish Foreign Ministry publishes related statements. For how those letters are structured, see The Worldlogue on Article 51 notifications and our own guide to reading Türkiye's official documents.

Key Players & Positions

The summaries below paraphrase official positions. Readers should consult the original texts: US State Department and White House releases, Russian Foreign Ministry statements, European Council conclusions, Syrian letters to the UN, and Iraqi Foreign Ministry statements.

United States

• Euphrates Shield: Washington supported Turkish-backed forces against DAESH with coalition air power at the outset, while urging YPG units to move east of the Euphrates.
• Olive Branch: US officials acknowledged Türkiye's security concerns about the PKK while urging restraint and a focus on the fight against DAESH.
• Peace Spring: The US repositioned troops before the launch, then criticized the operation. It imposed sanctions on Turkish ministries on 14 October 2019 and lifted them on 23 October after the pause. The 17 October joint statement set a 120-hour halt.
• Core divergence: The US lists the PKK but did not designate the YPG, and has described its SDF cooperation as operational and limited to the anti-DAESH mission.

Russia

Moscow has combined deconfliction with criticism. It negotiated the 22 October 2019 Sochi memorandum with Ankara, setting joint patrols along the border. Russian officials have said they understand Türkiye's border-security concerns but support Syria's territorial integrity and an eventual withdrawal of foreign forces. After Spring Shield, the 5 March 2020 Moscow protocol created a ceasefire line in Idlib and a joint patrol corridor along the M4 highway.

European Union and NATO

EU bodies have repeatedly urged restraint, humanitarian access and a political solution. In October 2019, EU foreign ministers condemned Peace Spring and called for it to end; arms-export decisions remained with member states. The EU lists the PKK as terrorist. NATO leaders expressed solidarity with Türkiye after the February 2020 Idlib strike while stressing de-escalation.

Syria

Under the Assad government, Damascus condemned each Turkish operation as aggression and a violation of Syrian sovereignty, and said so in letters to the UN. Following the change of government in December 2024, Syria's transitional authorities have engaged with Ankara on security, and an integration framework with the SDF was announced on 10 March 2025. Türkiye has said it supports Syrian unity and its institutions.

Iraq

Baghdad has repeatedly described Turkish military presence and strikes in northern Iraq as violations of Iraqi sovereignty, and has summoned Turkish diplomats and raised complaints at the UN, including after the July 2022 shelling at a Zakho resort, for which Türkiye denied responsibility. At the same time, Iraq's National Security Council banned the PKK as an organization in March 2024, and the two governments have discussed joint security mechanisms.

Civilian harm and governance concerns

UN bodies, including the Independent International Commission of Inquiry on Syria, and human rights groups have documented displacement and abuses by armed groups in areas of northern Syria under Turkish influence. Ankara states that it conducts operations with precision to spare civilians and heritage sites, and that it holds accountable those responsible for violations.

Source Comparison

To evaluate any claim, compare the primary texts: UN letters, Turkish Ministry of National Defence briefings, Council of the EU conclusions and Russian and US statements. Our Reader FAQ and Editorial Principles explain how Polipapers separates fact, position and source.

Key Terms & Related Guides

• Article 51 (UN Charter): preserves the 'inherent right' of self-defense against armed attack until the Security Council acts, and requires immediate reporting to the Council.
• PKK / KCK: the Kurdistan Workers' Party and its umbrella network, listed as terrorist by Türkiye, the United States, NATO and the European Union.
• PYD / YPG / SDF: the Syrian political party, its armed wing, and the broader force the YPG leads. Ankara regards the first two as PKK affiliates; the US has partnered with the SDF.
• DAESH: the Arabic-acronym name for ISIS, used in Turkish official documents.
• FETÖ: the Fetullahist Terrorist Organization, blamed by Türkiye for the 15 July 2016 coup attempt, which unfolded as Euphrates Shield began.
• Claw (Pençe): the series of operations against PKK positions in northern Iraq.

Related reading: Polipapers home, About Polipapers, The Paper Trail: Türkiye's official documents, and the sister analysis of Doctrine Review on UN Security Council reform.

Polipapers presents global and regional affairs with a dedicated perspective from Türkiye. Sections marked 'Türkiye's Position' reflect official Turkish policy and legal doctrines as stated by Turkish primary sources.