Conflicts in the 21st century

Conflicts in the 21st century
Name	Conflicts in the 21st century
Period	2001–present
Location	Global
Participants	United States, United Kingdom, Russia, China, NATO, European Union, United Nations, Islamic State of Iraq and the Levant, Al-Qaeda, Taliban, Houthis, Syrian opposition, Iraqi Security Forces, Yemeni Government
Casualties	Millions affected
Outcome	Ongoing geopolitical realignments

Contents

Conflicts in the 21st century encompass a complex set of military, political, ideological, technological, and humanitarian confrontations that have reshaped United States foreign policy, NATO operations, United Nations missions, and regional orders. Major events such as the War in Afghanistan (2001–2021), the Iraq War, the Russo-Ukrainian War, and the Syrian civil war have driven shifts in alliances, law, and norms involving actors from European Union institutions to non-state movements like Islamic State of Iraq and the Levant and Al-Qaeda. These conflicts intersect with developments in cybersecurity, international humanitarian law, and global displacement governed by institutions such as the Office of the United Nations High Commissioner for Refugees.

Background and definitions

Scholars and practitioners draw on precedents from the Cold War and the Balkan Wars to define 21st-century hostilities, distinguishing interstate wars such as the Russo-Ukrainian War from intrastate crises like the Yemeni Civil War (2014–present), and hybrid conflicts exemplified by Russia's annexation of Crimea and the Second Nagorno-Karabakh War. Legal and policy frameworks reference instruments including the United Nations Charter, the Geneva Conventions, and rulings from the International Court of Justice and the International Criminal Court to categorize aggression, occupation, and humanitarian intervention. Definitions also incorporate battles such as the Battle of Mosul (2016–17), operations like Operation Enduring Freedom, and campaigns led by coalitions including Coalition forces in Iraq and Counter-ISIL coalition.

Interstate combat in the 21st century features direct and proxy engagements: the Iraq War involved United States Armed Forces, United Kingdom Armed Forces, and coalition partners against the Ba'athist Iraq regime and later insurgents; the Russo-Ukrainian War—including the Annexation of Crimea by the Russian Federation and the 2022 Russian invasion of Ukraine—pitted Russian Armed Forces against Armed Forces of Ukraine and elicited responses from NATO, European Union, and sanctions by entities such as the G7. Regional conflicts involved states like India and Pakistan in flashpoints over Kashmir, and the India–China border standoff along the Line of Actual Control highlighted great-power competition between People's Liberation Army and Indian Armed Forces. The Israel–Palestine conflict continued with periodic escalations such as operations by Israel Defense Forces and armed groups like Hamas.

Non-state armed groups and terrorist networks have driven insurgencies and transnational attacks: Al-Qaeda carried out the September 11 attacks leading to the War on Terror, while Islamic State of Iraq and the Levant captured territory in Iraq and Syria before suffering defeats in operations like the Battle of Raqqa (2017). Other actors—Hezbollah, Shabab, Boko Haram, and Jaish-e-Mohammed—have influenced regional security and international counterterrorism partnerships such as Operation Inherent Resolve and intelligence cooperation among agencies including the Central Intelligence Agency and MI6.

21st-century conflicts expanded into cyberspace and information domains, with incidents attributed to states and proxies: alleged operations by units like Russia's GRU and China's People's Liberation Army Strategic Support Force targeted infrastructure, elections, and enterprises in the United States, Germany, and Ukraine. Notable episodes include cyberattacks on Estonia and disinformation campaigns linked to the 2016 United States presidential election, prompting norms discussions at the United Nations Group of Governmental Experts and defensive measures by entities such as NATO Cooperative Cyber Defence Centre of Excellence.

War-related humanitarian crises produced mass displacement and human suffering: refugee flows to the European Union from Syria and Afghanistan strained asylum systems coordinated with UNHCR; internally displaced persons in Iraq, Yemen, and the Democratic Republic of the Congo exacerbated public health and famine risks addressed by World Food Programme and International Committee of the Red Cross. Atrocities and allegations of war crimes prompted investigations by the International Criminal Court and special tribunals concerning events in Darfur, Sri Lanka, and Myanmar involving the Rohingya crisis.

Responses to 21st-century conflicts combined military intervention, sanctions, diplomacy, and peacebuilding: peace operations by the United Nations Security Council and negotiations mediated by actors such as the Quartet on the Middle East, European External Action Service, and regional organizations like the African Union sought ceasefires and transitions. Legal debates over doctrines including responsibility to protect, humanitarian intervention, and the jurisdiction of the International Criminal Court informed interventions in Libya, Kosovo precedents, and accountability mechanisms addressing leadership figures such as Muammar Gaddafi, Slobodan Milošević, and wartime commanders indicted by tribunals.

Category:21st-century conflicts