As it happened: East Ukraine crisis

Key Points

• Ukraine's president pledges a full-scale "anti-terrorist operation" against pro-Russian militants
• Armed men have seized official buildings in a number of cities in the eastern Donetsk region
• A Ukrainian officer is killed in a gun battle with pro-Russian militants on the outskirts of Sloviansk
• Russia warned earlier that any use of force in east Ukraine could scupper crisis talks due this week
• The West accuses Moscow of inciting the trouble. The Kremlin denies the charge.
• All times BST