Russian President Vladimir Putin has launched what he referred to as a "military operation" in eastern Ukraine.
Prime Minister Boris Johnson branded it a “catastrophe for our continent”.
Labour leader Sir Keir Starmer said: “Vladimir Putin’s attack on Ukraine is unprovoked and unjustifiable".
Meanwhile, NATO Secretary General Jens Stoltenberg said Russia’s actions were a “grave breach of international law”.
This video feed comes live from the Ukrainian capital, Kiev.