Tijdlijn van de ontwikkelingen in OekraοneNOVEMBER* Nov 21: Kiev suddenly announces suspension of trade and association talks with the EU and opts to revive economic ties with Moscow, triggering months of mass rallies in Kiev.
* Nov 30: Riot police try to break up the Kiev demonstration by force. Protest turns against Yanukovich and his government.
DECEMBERProtests continue with crowds of up to 800,000. Some clashes with police. Opposition forms bloc called Maidan. Yanukovich and Putin meet, Putin agrees to buy $15 billion of Ukrainian debt and to slash by a third the price of Russian gas supplies to Ukraine.
JANUARY* Jan 22: Three people die in protests in Kiev. EU threatens action over crisis. Talks between opposition, Yanukovich fail.
* Jan 23: Washington threatens sanctions over violence.
* Jan 26: Unrest spreads to pro-Yanukovich east.
FEBRUARYAnti-government protests turn increasingly violent. At least 77 people killed in clashes between demonstrators and police.
* Feb 21: Opposition leaders sign EU-mediated peace pact with Yanukovich.
* Feb 22: Ukraine's parliament votes to remove Yanukovich, who flees. Arch-rival Yulia Tymoshenko released from jail.
* Feb 26: Ukraine appoints new government. Angry Russia puts 150,000 troops on high alert.
* Feb 27-28: Armed men seize Crimea parliament, raise Russian flag. Militia take control of two airports in Crimea.
MARCH* March 1: Putin wins parliamentary approval to invade Ukraine, angering the White House. Russian forces fan out in Crimea.
* March 6: Crimea's leadership votes to join Russia. U.S. President Barack Obama orders sanctions on those responsible for Moscow's actions in Ukraine.
EU leaders hold emergency summit to find ways to pressure Russia to back down and accept mediation.
* March 15: Two killed in clashes between pro-Russian demonstrators and Ukrainian nationalists.
* March 16: Referendum held in Crimea, shows overwhelming support for joining the Russian Federation.
* March 21: Putin signs laws completing annexation of Crimea. The U.S. imposes sanctions on Putin's close allies, EU follows with similar measures.
* March 23: NATO says Russia has amassed a large force at Ukraine's border.
* March 24: Ukraine pulls troops from Crimea.
APRIL* April 2: NATO suspends cooperation with Russia.
* April 7: Pro-Russia activists in eastern Ukraine proclaim the creation of the "Donetsk People's Republic".
* April 12: Separatists take control of city of Slaviansk in eastern Ukraine. Kiev prepares troops.
* April 13: One Ukrainian state security officer killed and five wounded in operation against separatists.
* April 14: Obama warns Putin in phone call that Moscow would face further costs for its actions in Ukraine.
* April 17: Pro-Russian separatists seize armored vehicles of Ukraine forces trying to recapture rebel-controlled town.
* April 18: The United States, Russia, Ukraine and the EU reach deal for illegal armed groups to disarm and end occupations of public buildings and spaces.
* April 19: Separatists say they will not sign deal until the Kiev government steps down.
* April 24: Ukraine sends in troops again to try to expel the separatists in Slaviansk, kill five rebels.
* April 25: Ukrainian forces mount full blockade of Slaviansk. Separatists detain group of international observers, say a Kiev "spy" among them.
* April 26: G7 leaders agree to impose extra sanctions on Russia over Ukraine. Yatsenyuk cuts short a Vatican trip to see Pope Francis, saying Russian warplanes violated Ukraine's airspace seven times overnight. Russia denies the claim.
* April 27: Rebels say the OSCE observers are "prisoners of war" and present them in front of the press, where they say they have not been mistreated.
* April 28: West imposes new sanctions on Moscow. Russia vows a "painful" response. Russia says troops have returned to barracks after conducting exercises on the border with Ukraine. The West says there is no sign of this pull-back. Russia assures the US it will not invade Ukraine.
* April 29: Russia accuses Washington of seeking to revive Iron Curtain policies. Putin warns sanctions could harm Western interests in Russia's lucrative energy sector, denies there are Russian forces in eastern Ukraine.
* April 30: Kiev says its armed forces are on "full combat alert" against a possible Russian invasion. Interim president Oleksandr Turchynov admits Kiev is "helpless" to prevent rebels over-running towns. Rebels storm the regional police building and town hall in Gorlivka. The International Monetary Fund approves $17-billion aid deal for the beleaguered Ukrainian economy.
MAY* May 1: Some 300 pro-Russian militants seize prosecutor's office in Donetsk amid violent clashes with police. Conscription reintroduced for all Ukrainian men aged 18-25.
* May 2: Ukrainian commandos launch pre-dawn raid to retake Slavyansk. Rebels shoot down two helicopters and two servicemen are killed.
* May 3: Slavyansk rebels free OSCE inspectors after Kremlin envoy intervenes. Two days of mourning proclaimed over Odessa deaths. Fierce firefights around Slavyansk and nearby towns as military seeks to retake control.
* May 4: Kiev vows to expand "anti-terrorism" operations. Yatsenyuk launches probe into security forces in Odessa over the deaths.
May 5: A fresh assault begins on Slovyansk. The interior minister says more than 30 rebels are killed. Four servicemen are also killed. Russia warns Europe's peace is at risk. UN chief Ban Ki-moon offers to mediate personally as the West launches new diplomatic push.
May 6: Russia rejects a German-led move for a new peace meeting. Germany says Ukraine is on the verge of war.
May 7: In a surprise announcement, Putin calls for rebel independence referendums to be pushed back and endorses Ukraine's planned presidential election. He says Russian troops pulled back from border. The new overall toll from Ukrainian military operations stands at 14 servicemen dead.
May 8: Rebels vow to press on with referendums despite Putin's call. Russia conducts military exercises, test-fires several missiles, and says nuclear capabilities are on "constant combat alert." NATO says there is no sign of a Russian troop pull-back.
May 9: Putin flies to annexed Crimea after overseeing a display of military might in the Red Square where he paid tribute to Russia's "all-conquering patriotic force." Clashes break out in Mariupol that the interior minister says leave 21 dead.
May 10: France and Germany threaten to step up sanctions against Russia if the May 25 election is disrupted and urge Kiev to cease "offensive" operations before the vote.
May 11: "Referendums" are held in the provinces of Luhansk and Donetsk. Fighting is reported around Slovyansk as rebels try to retake TV tower.
May 12: Pro-Russia activists declare resounding victory in a twin referendum on sovereignty for eastern Ukraine. The provinces of Donetsk and Luhansk voted on Sunday to secede from Ukraine. Russian gas giant Gazprom gives Ukraine until June 3 to pay $1.6bn for natural gas. The EU ramps up sanctions on Moscow.
May 13: Seven Ukrainian soldiers killed in rebel ambush in the deadliest single loss of life for the military since the start of the uprising.
May 14: Ukraine hosts "national unity" talks based on an OSCE roadmap but rebels are not invited.