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Pro-Russian gunmen seize key buildings in the Crimean capital, Simferopol.
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Russia's parliament approves President Vladimir Putin's request to use force in Ukraine to protect Russian interests. Pro-Russian rallies are held in several Ukrainian cities outside Crimea.
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President Putin signs a bill to absorb Crimea into the Russian Federation.
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Ukraine's Interim Prime Minister Arseniy Yatsenyuk offers to devolve more powers to the eastern regions, as pro-Russia occupations in Donetsk and Luhansk continue.
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Russia, Ukraine, the US and the EU say they have agreed at talks in Geneva on steps to "de-escalate" the crisis in eastern Ukraine. Three people are killed when Ukrainian security forces fend off a raid on a base in Mariupol.
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In an apparent shift in Russian policy, President Putin calls for referendums in eastern Ukraine to be postponed to encourage dialogue. He also describes Ukraine's presidential elections scheduled for 25 May as a move "in the right direction".
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Pro-Russian rebels shoot down a military helicopter near Sloviansk, killing 14 people including a general.
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Nato pledges to bolster its defence capabilities in response to Russian actions in Ukraine.
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Separatist rebels take two Ukrainian military bases in the eastern region of Luhansk.
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Ukraine says three Russian tanks have entered rebel areas in the east. Russia denies the allegations.
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A violent protest outside the Russian embassy in Ukraine leads to windows being smashed and cars being overturned. Pro-Russia separatists shoot down a military plane in the east, killing 49 people.
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Malaysia Airlines flight MH17 from Amsterdam is shot down near the village of Grabove in rebel-held territory close to the border with Russia. A total of 298 people are killed including 80 children. Western nations said the plane was hit by a Russian-supplied SA-11 missile fired by rebels.
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The EU and US announce new sanctions against Russia with focus on oil sector, defence equipment and sensitive technologies.
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Ukrainian forces have virtually surrounded the city of Luhansk. The city's supplies of power and water supplies run low and communications are down.
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Dutch experts find that Malaysia Airlines flight MH17 broke up in mid-air after being hit by "objects" that "pierced the plane at high velocity" in July. Correspondents say this matches claims that MH17 was hit by missile shrapnel. The 5 September ceasefire is largely holding, but the EU formally adopts new sanctions on Russia, with no word on when they will be put in place.