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Ukrainian President Volodymyr Zelensky has introduced martial law, and urged people to remain calm in a brief video address on Thursday morning.

It comes after Russian President Vladimir Putin announced a "military operation" in Ukraine's Donbas region, urging Ukrainian soldiers in eastern Ukraine to lay down weapons and return to their homes.

Ukraine’s Foreign Minister has accused Russia of starting a full-scale war and is urging the UN "to do everything possible" to stop it.

We’ll bring you the latest from Ukraine and reaction from the international community.