US President Barack Obama has warned Moscow that any military intervention in Ukraine would be “deeply destabilising”, as Kiev claims Russian troops have invaded.
He said: “The United States will stand with the international community in affirming that there will be costs for any military intervention in Ukraine.
“We are now deeply concerned by reports of military movements taken by the Russian Federation inside of Ukraine.”
US officials say Mr Obama may cancel plans to attend the G8 summit in June if it is proved that Russia has sent troops into the Crimea.
Russian President Vladimir Putin is scheduled to host the economic meeting in Sochi, the site of the recent Winter Olympics.
The administration official said the US was in discussions about the summit with European partners, adding that it was difficult to see how leaders would attend if Russia had forces in Crimea.
The US has also warned that discussions on deepening trade ties with Moscow may be halted in response to any Russian aggression… see more