Key conclusions up front
The war in Ukraine that escalated in 2014 and again in 2022 did not have a single person who "started" it in isolation. It emerged from overlapping decisions by multiple actors over years, rooted in Ukraine’s internal politics, its evolving relationship with the European Union and Russia, and long-standing disputes over identity, security, and territory. Russia’s full-scale invasion in 2022 was ordered and executed by the Russian state under Vladimir Putin, preceded by the annexation of Crimea in 2014 and sustained conflict in eastern Ukraine from 2014 onward. This explainer separates immediate triggers from deep causes and outlines verifiable milestones.
Core sequence of events that began the current war
The most direct answer to who started the war in Ukraine depends on which phase you mean. The large-scale, multi-front war that began in 2022 was initiated by the Russian Federation under President Vladimir Putin, who ordered a full-scale invasion on 24 February 2022. Earlier, the conflict in eastern Ukraine and the annexation of Crimea began after Ukraine’s political transition in late February 2014, when Russia moved to seize Crimea and support armed groups in Donbas. Context matters: these actions followed years of tension, competition between Ukraine toward Europe and Russia’s stated security concerns, and disputes over language, governance, and sovereignty.
Deep causes versus immediate triggers
Understanding who started the war requires distinguishing deep causes from immediate triggers. Deep causes include Ukraine’s long-term orientation toward European integration, contested national identity, historical ties between Russia and Ukraine, and security dilemmas surrounding NATO and EU expansion. Immediate triggers were concrete events and decisions, such as Ukraine’s Revolution of Dignity in late 2013–2014, which led to the removal of President Viktor Yanukovych, Russia’s annexation of Crimea in March 2014, and the outbreak of war in Donbas in April 2014. In 2022, the immediate trigger was Russia’s decision to recognize separatist-held regions in Donetsk and Luhansk and to proceed with a full-scale invasion.
Timeline of key decisions and milestones
No single actor bears all responsibility, but key decisions by Russian leadership were pivotal. Below is a concise, verified timeline of major milestones that shaped the conflict.
| Date or Period | Event | Why it matters |
|---|---|---|
| 2013–2014 | Euromaidan protests and transition, culminating in Yanukovych’s removal | Shifted Ukraine’s political alignment, triggering Russian concerns and responses |
| February 2014 | Russia’s annexation of Crimea | First major escalation; annexation not recognized by most of the world |
| April 2014 onward | Armed conflict in Donbas (Donetsk and Luhansk) | Russian-backed separatists sustained fighting; thousands killed before 2022 |
| 2015 | Minsk II agreements | Diplomatic effort to end Donbas war; only partially implemented |
| 2021–2022 | Russian military buildup on Ukraine’s borders and diplomatic demands | Signaled intent to act unless security guarantees were met |
| 24 February 2022 | Russian full-scale invasion of Ukraine | Largest escalation; widespread civilian and military impacts |
Actors and decisions: who did what
Several actors made choices that shaped the course of the war:
- Russian leadership (Vladimir Putin and key advisors): Chose to recognize Donbas separatist regions on 21 February 2022 and ordered the invasion on 24 February 2022; earlier authorized the annexation of Crimea in 2014 and sustained support for separatists.
- Ukrainian authorities and government: Responded to domestic political change and sought closer EU and NATO ties; engaged in conflict after Russia-backed armed groups took up arms in Donbas.
- Western governments and institutions: Provided diplomatic, financial, and military support to Ukraine after 2014 and increased sanctions and aid after 2022; pursued dialogue with Russia while reinforcing deterrence.
- Separatist forces in Donbas: Armed and supported by Russia, established de facto authorities in parts of Donetsk and Luhansk from 2014 onward.
Common misunderstandings to avoid
When people ask who started war in Ukraine, a few simplified claims often appear that don’t match verified evidence. Understanding these helps clarify the picture:
- Myth: Ukraine itself started the war by attacking Donbas. Verified assessments show large-scale hostilities were initiated by Russian-backed forces after 2014, and Russia intervened directly in 2022.
- Myth: The war began only in 2022 with no earlier fighting. In reality, war in Donbas began in 2014 and continued for eight years before the 2022 invasion.
- Myth: A single person alone started the entire conflict. Complex wars have multiple decision points; attributing causation to one person oversimplifies responsibility.
International law and legitimacy
Under international law, the annexation of Crimea and the large-scale invasion of 2022 violate the UN Charter’s prohibition on the use of force and principles of territorial integrity. UN General Assembly resolutions have affirmed Ukraine’s sovereignty and called for the withdrawal of Russian forces. How we label these acts matters for accountability, historical record, and future legal and diplomatic consequences.
What this means going forward
The origins of the war shape how conflicts end and how security is rebuilt. Clarity on who made key decisions and when helps policymakers, journalists, and the public avoid misattribution and focus on durable solutions. Priorities include upholding international law, supporting affected civilians, and addressing the political and security grievances that underlie the conflict without normalizing violations of sovereignty.
Frequently asked questions
- Did Ukraine provoke the war by seeking NATO membership? Ukraine’s sovereign choice about its security orientation is a factor, but it does not justify the use of force. International law does not recognize the right of any state to use armed force in response to a neighbor’s alliance choices.
- Was the conflict in Donbas a civil war? It involved domestic armed groups but was heavily fueled and sustained by Russian support; experts often describe it as a conflict enabled by Russia rather than a purely internal civil war.
- Can the war in Ukraine be traced to NATO expansion alone? NATO expansion is one element of the broader geopolitical context, but it does not alone explain the decision to use military force; multiple political, historical, and security factors are involved.
Summary
The war in Ukraine had multiple origins and key decision points. The full-scale invasion that began in 2022 was ordered by the Russian leadership; earlier escalation stemmed from Russia’s annexation of Crimea and support for armed groups in Donbas after Ukraine’s 2014 political shift. No single person bears sole responsibility, but verifiable actions by state actors—particularly Russia—set the course for the enduring conflict.