Russia’s Black Sea Fleet has told Ukrainian forces in Crimea to surrender by 3am or face a military assault. Follow the latest updates here
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Russia’s President Vladimir Putin, centre, accompanied by Russian Defence Minister Sergei Shoigu, front left, walks to watch military exercises upon his arrival at the Kirillovsky firing ground
17.15 BREAKING: Our man in Moscow Howard Amos says that the Russian government has denied reports of an ultimatum issued to the Ukraine:
The Russian Defense Ministry has dismissed claims that an ultimatum to surrender has been issued to Ukrainian armed forces in Crimea.
A Defense Ministry spokesperson described the reports of an ultimatum as “complete nonsense,” according to Russian business daily Vedomosti.
17.09 According to Reuters, the White House has said it will no longer send a presidential delegation to the Paralympic Games in Sochi in protest at the situation in Ukraine.
More Russian troops arrive in Ukraine
Obama scolds Russia that it is “on the wrong side of history” and its “violating international law”