WASHINGTON (Reuters) - United States President Barack Obama ruled out US military involvement in Ukraine on Wednesday, emphasising diplomacy in the standoff with Russia over Crimea.

"We are not going to be getting into a military excursion in Ukraine," Mr Obama told KNSD, San Diego's NBC affiliate, in an interview.

Mr Obama, who imposed sanctions on 11 Russian and Ukrainian officials on Monday, said the US will push diplomatic efforts to bring pressure on Russia to loosen its grip on the Crimea region of southern Ukraine.

"There is a better path, but I think even the Ukrainians would acknowledge that for us to engage Russia militarily would not be appropriate and would not be good for Ukraine either," Mr Obama said.