As it happened: Ukraine crisis

Key Points

• Russia's President Vladimir Putin says there is no need to send Russian troops to Ukraine, but the use of force remains "a last resort"
• Mr Putin says Russia reserves the right to intervene if there is "lawlessness" in Russian-speaking areas of eastern Ukraine
• US Secretary of State John Kerry has condemned what he describes as "Russia's act of aggression in Ukraine"
• US President Barack Obama said Mr Putin was "not fooling anyone" and that Russia had no right to intervene in Crimea
• Ukraine's interim government says 16,000 Russian troops are now deployed across Crimea
• Moscow has agreed to attend an extraordinary meeting of Nato members on Wednesday. All times GMT