Russia’s large-scale invasion of Ukraine began on 24 February 2022, when President Vladimir Putin announced a "special military operation." This marked a major escalation after months of troop buildup along Ukraine’s borders. The following table outlines key dates widely cited by governments and international bodies as milestones in the conflict. In the opening days, Russian forces attacked airfields, border posts, and command centers, and moved toward Kyiv, Kharkiv, and other cities. Diplomacy and multiple rounds of sanctions followed, with frontline changes persisting through 2023 and 2024.
Key timeline of Russia’s invasion of Ukraine
| Date or Period | Event | Why it matters |
|---|---|---|
| 2014 | Russia annexed Crimea and supported armed conflict in eastern Ukraine | Established enduring Russian control over Crimea and laid groundwork for later escalation |
| early 2021 | Russian military buildup along Ukraine’s borders begins to grow notably | Signaled preparation for large-scale operations; drew repeated diplomatic warnings |
| 24 February 2022 | Putin announced a full-scale "special military operation" | Marks the start of the widely recognized second, large-scale invasion of Ukraine |
| late February–March 2022 | Russian forces attacked cities including Kyiv, Kharkiv, Mariupol; Bucha emerged as a symbol of war crimes | Led to global condemnation, humanitarian crises, and waves of refugees |
| summer 2022 | Ukraine launched counteroffensives in the south and east | Shifted momentum; international military aid increased substantially |
| September 2022 | Russia proclaimed annexation of four Ukrainian regions; conducted referendums widely viewed as illegitimate | Marked an expansion of declared territorial aims and intensified Western sanctions |
| late 2022–2023 | Continued heavy fighting, with attrition-focused campaigns in the east | Frontlines fluctuated but remained largely static around key towns |
| 2023–2024 | Russian strikes on energy and civilian infrastructure increased; drone and missile campaigns persisted | Caused widespread disruption and raised questions about long-term resilience |
| 2024–2025 | Ongoing limited ground engagements; continued diplomatic and aid debates in Western capitals | Conflict remains unresolved with protracted humanitarian and geopolitical effects |
Context and definition: what counts as invasion and escalation
Experts use invasion to denote the cross-border use of organized military forces intended to control territory. By this standard, large-scale Russian operations that began in February 2022 qualify as an invasion, distinct from earlier interventions such as the 2014 Crimea annexation and limited deployment in Donbas. The scale of 2022 included ground troops, armor, air assets, and sustained artillery, affecting multiple Ukrainian regions. Subsequent missile and drone campaigns, as well as naval incidents, have continued to escalate risks without resetting the initial invasion date.
How some governments and organizations refer to the timeline
- United States and European Union: emphasize 24 February 2022 as the start of the full-scale invasion
- United Nations: documents 2014 as the start of the Ukraine-related conflict, treating 2022 as an intensification
- Russian authorities: refer to the 2022 operation as a "special military operation" aimed at demilitarization and protection of residents
Immediate impacts and humanitarian consequences
Within days of the 24 February launch, thousands of civilians were killed or injured, millions were displaced internally and abroad, and critical infrastructure was damaged across multiple oblasts. Cities such as Mariupol bore prolonged siege conditions, while schools, hospitals, and residential areas faced repeated strikes. The invasion triggered one of Europe’s fastest-growing refugee crises since World War II, testing reception capacities in neighboring countries and reshaping regional politics.
International reaction and sanctions
In response to the invasion, governments coordinated unprecedented sanctions targeting Russian financial institutions, central bank reserves, and key sectors such as energy and defense. Export controls on advanced technologies and dual-use goods aimed to limit Russia’s ability to sustain its military effort. Sanctions relief has remained tightly linked to tangible shifts in behavior, with repeated assessments emphasizing the need for accountability and adherence to international law.
What the evidence shows today
As of the most recent assessments, Russia continues military operations in eastern and southern Ukraine, with periodic announcements of mobilization and defense measures. The widely accepted start date for the second full-scale invasion remains 24 February 2022. While some narratives seek to blur earlier tensions with the events of 2022, authoritative sources treat the 2022 operation as the principal escalation that shaped the current conflict landscape. Diplomatic talks, prisoner exchanges, and localized ceasefire discussions have not yet produced a sustainable path to end hostilities.
Where to look for authoritative updates
For ongoing tracking, consult reports from bodies such as the United Nations, International Committee of the Red Cross, and mainline research institutions that apply consistent methodologies. Government statements from Ukraine, Russia, and key partner states also offer primary-source context, though they often frame events differently. Reliable timelines distinguish between allegations, confirmed incidents, and independently verified facts, making it easier to maintain clarity amid rapidly changing claims.
Quick comparison of phases
- 2014: Crimea annexation and onset of Donbas conflict
- 2021–early 2022: Buildup of forces and diplomatic standoffs
- 24 February 2022: Start of large-scale invasion (second full-scale invasion)
- 2022–2025: Protracted warfare with evolving tactics, sanctions, and humanitarian impact
Understanding the chronology helps clarify cause and effect, reduces ambiguity in media coverage, and supports informed discussion about consequences. The invasion’s scale, international responses, and humanitarian toll remain defining features of global security in the 2020s.