President Vladimir Putin rebuffed a warning from US President Barack Obama over Moscow’s military intervention in Crimea, saying yesterday that Russia could not ignore calls for help from Russian speakers in Ukraine.

After an hour-long telephone call, Putin said in a statement that Moscow and Washington were still far apart on the situation in the former Soviet republic, where he said the new authorities had taken “absolutely illegitimate decisions on the eastern, southeastern and Crimea regions.

“Russia cannot ignore calls for help and it acts accordingly, in full compliance with international law,” Putin said.

Meanwhile, later yesterday armed men thought to be Russians drove a truck into a Ukrainian missile defence post in the Crimea region and took control without a shot being fired, a Reuters reporter on the scene said.

Initial reports said the truck had smashed through the gates and that the post in the city of Sevastopol was being stormed but the reporter could not see any signs of the gates being damaged.

Border guard says 30,000 Russian troops in Ukraine

A Ukrainian military official, Vladislav Seleznyov, said by telephone that the armed men took over the base without any shooting and that no one was hurt. Another Ukrainian official said at the post that he was mediating between the Ukrainian forces and the armed group inside, and that no arms had been seized. Ukraine’s border guards said Moscow had poured troops into the southern peninsula where Russian forces have seized control.

Serhiy Astakhov, an aide to the border guards’ commander, said there were now 30,000 Russian soldiers in Crimea, compared to the 11,000 permanently based with the Russian Black Sea fleet in the port of Sevastopol before the crisis.

Putin denies that the forces with no national insignia that are surrounding Ukrainian troops in their bases are under Moscow’s command, although their vehicles have Russian military plates. The West has ridiculed his assertion.

The most serious east-west confrontation since the end of the Cold War – resulting from the overthrow last month of President Viktor Yanukovych after violent protests in Kiev – escalated on Thursday when Crimea’s Parliament, dominated by ethnic Russians, voted to join Russia. The region’s government set a referendum for March 16 – in just eight days’ time.

EU leaders and Obama denounced the referendum as illegitimate, saying it would violate Ukraine’s Constitution.

Obama announced the first sanctions against Russia on Thursday since the start of the crisis, ordering visa bans and asset freezes against so far unidentified people deemed responsible for threatening Ukraine’s sovereignty. Russia warned that it would retaliate against any sanctions.

Japan endorsed the Western position that the actions of Russia, whose forces have seized control of the Crimean peninsula, constitute “a threat to international peace and security”, after Obama spoke to Prime Minister Shinzo Abe.

China, often a Russian ally in blocking Western moves in the UN Security Council, was more cautious, saying that economic sanctions were not the best way to solve the crisis and avoiding comment on the legality of a Crimean referendum on secession.

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