Introduction: clarifying the invasion timeline
On 24 February 2022, Russia launched a full-scale invasion of Ukraine, escalating a conflict that had simmered since 2014. This timeline outlines the sequence of key military, political, and diplomatic events leading to and following the invasion. Understanding these dates and milestones helps clarify responsibility, duration, and phases of the war. The details below are drawn to the greatest extent possible from verifiable official statements, international investigations, and authoritative open-source intelligence.
Phase 1: Diplomatic escalation and military buildup (2021–early 2022)
In 2021, Russia significantly increased troop concentrations along Ukraine’s borders and issued security demands to NATO and the United States. Throughout late 2021 and early 2022, diplomatic negotiations intensified but failed to produce a compromise. On 21 February 2022, Russia recognized the Donetsk and Luhansk People’s Republics and announced a ‘peacekeeping’ deployment, a step widely seen as a precursor to invasion.
Key diplomatic and military markers before 24 February
- April 2021: Large‑scale Russian drills near the Ukrainian border begin.
- October–December 2021: Russia tables demands for NATO rollback, non‑membership guarantees, and limits on Eastern European security cooperation.
- January 2022: NATO allies announce defensive packages for Eastern Europe amid rising tensions.
- 17–23 February 2022: Partial mobilization and movement of Russian assets into Belarus precede the main offensive.
Phase 2: Launch of the invasion (24 February 2022)
In the early hours of 24 February 2022, Russian President Vladimir Putin announced a ‘special military operation’ in Donbas and outlined objectives that effectively called for regime change in Kyiv. Shortly thereafter, missile strikes hit Kyiv, Kharkiv, Mariupol, and other cities. Russian columns advanced from Belarus toward Kyiv, from Crimea toward central and southern Ukraine, and from the east toward Donbas. Ukrainian forces and territorial defenders organized rapid resistance, disrupting Russian momentum.
Phase 3: First month and initial battles (February–March 2022)
In the first weeks, Russian forces attempted a rapid Kyiv offensive, but logistical strains and determined Ukrainian defenses led to a withdrawal by early April. Key early engagements included the battles for Antonov Airport near Kyiv, Hostomel airfield, and street fighting in cities such as Mariupol, Chernihiv, and Sumy. During this period, evidence of war crimes emerged, including the Bucha massacre near Kyiv, widely documented by international investigators and satellite imagery. By late March, Russian forces regrouped and shifted focus to the Donbas and southern Ukraine.
Phase 4: Consolidation and southern offensives (April–September 2022)
In April–May 2022, Russia concentrated on capturing Mariupol to secure a land bridge to Crimea, culminating in the capture of Azovstal in May. In the east, the battle for Sievierodonetsk and Lysychansk intensified through the summer, ending in Russian gains by July. During this phase, Ukraine conducted counterattacks in the northeast, retaking some settlements around Kharkiv, while Western security partners increased military aid to bolster Ukrainian defense and logistics.
Phase 5: Expansion and mobilization (September 2022–mid-2023)
In September 2022, Russia announced the annexation of four Ukrainian regions following controversial referendums not recognized internationally. Later that month, Ukraine launched a successful counteroffensive in the northeast, liberating key areas in Kharkiv Oblast. In the south, Ukraine pressed toward Kherson, which was liberated in November 2022. Throughout 2023, both sides entrenched, with Russia mobilizing additional troops and intensifying drone and missile campaigns against infrastructure, while Ukraine sought advanced Western weaponry to sustain its defense.
Phase 6: Recent stabilization and protracted conflict (2024–present)
By 2024, the frontline had largely stabilized into positional warfare, with incremental Russian advances in the east countered by persistent Ukrainian resistance. In 2023 and 2024, Ukraine continued to receive Western assistance, including air defense systems and long-range strike capabilities, aiming to maintain deterrence and limit escalation risks. Diplomatic efforts remained constrained, and the war settled into a protracted conflict with significant humanitarian, economic, and geopolitical implications.
Verified timeline at a glance
| Date or Period | Event | Why it matters |
|---|---|---|
| 2021–early 2022 | Russian military buildup and diplomatic demands | Context for invasion; shows pre‑planning and political conditions |
| 21 February 2022 | Recognition of Donetsk and Luhansk; ‘peacekeepers’ announced | Legal pretext and escalation indicator widely noted by governments |
| 24 February 2022 | Full‑scale invasion launched | Core date marking start of large‑war dynamics |
| March–April 2022 | Initial Kyiv offensive stalled; withdrawal begins | Demonstrates Ukrainian resistance and Russian logistical limits |
| March–May 2022 | Battle for Mariupol and securing of land bridge to Crimea | Strategic Russian objective; significant humanitarian impact |
| May 2022 | Capture of Sievierodonetsk/Lysychansk in Donbas | Russian advance in the east; shift to attritional warfare |
| September 2022 | Annexation referendums and declarations | International isolation and legal consequences |
| 29–30 September 2022 | Counteroffensive near Kharkiv liberates territory | Shows Ukrainian capacity for localized reverses of Russian gains |
| 6 November 2022 | Kherson liberated by Ukrainian forces | Key symbolic and operational victory in the south |
| 2023–2024 | Protracted positional warfare and infrastructure attacks | Continued strain on civilians and stabilization of frontlines |
Definitions and operational terms
Familiar terms help clarify reporting and discourse:
- Special military operation: The Russian official term for the invasion announced by President Putin on 24 February 2022.
- Full‑scale invasion: Descriptor used by governments and analysts for the multi‑regional, cross‑border attack that began on 24 February 2022.
- Donbas: Short for Donetsk and Luhansk; the eastern Ukrainian region at the heart of Russian stated objectives since 2014.
- Land bridge to Crimea: Russian strategic aim to connect the annexed Crimean Peninsula with mainland territory via captured coastal areas in southern Ukraine.
- Annexation referendums: September 2022 votes organized by Russian authorities in occupied territories; widely condemned as illegitimate by the international community.
Consequences and broader context
The invasion triggered one of the fastest‑growing refugee crises in Europe since Worlding War II, severe economic sanctions on Russia, and a major reconfiguration of European security policy. Civilian infrastructure has been extensively damaged, and both sides have documented serious violations of international humanitarian law. The war has also driven up global energy and food prices, highlighting the conflict’s reach beyond Ukraine’s borders. Ongoing diplomatic discussions remain limited, and the humanitarian and reconstruction needs will shape the post‑war landscape for years.
Conclusion
The invasion of Ukraine began on 24 February 2022, following months of military buildup and unresolved diplomacy. The conflict has since evolved through distinct operational phases—from initial rapid advances to attritional warfare in the east and south. Key dates such as 24 February 2022 and 6 November 2022 mark pivotal moments in the war’s trajectory. Understanding this timeline and the verified context helps clarify responsibility, inform policy debates, and support humanitarian and diplomatic efforts toward a sustainable resolution.
Related topics
- 2014 Russian annexation of Crimea and conflict in Donbas
- International sanctions on Russia
- Humanitarian impact and refugee crisis
- Ukraine’s territorial integrity and postwar reconstruction