A top Russian official has accused the US of "childish tantrums" in its response to the annexation of Crimea, and suggested that American politicians practise yoga and watch sitcoms to help chill out.

"Clearly, the US leadership is really annoyed, and cannot come to terms with the new situation, which has arisen in large part due to the deliberate line taken by the US and its allies in Europe to prepare anti-Russian forces to take power in Ukraine," said deputy foreign minister, Sergei Ryabkov, in an interview with Interfax.

"Trying to demonstrate how unhappy it is with the exercise of free will by the population of Crimea and the decisions we took related to it, Washington is ruining contacts even in places where continuing dialogue is in their own interests."

In addition to sanctions against a number of businessmen and politicians considered to be close to the Russian president, Vladimir Putin, the US has responded with other measures, including cancelling all co-operation between Nasa and the Russian space agency, except for joint work on the International Space Station.

"The situation is turning into a joke when, for example, meetings between meteorologists are cancelled," said Ryabkov.

"What can we advise our American colleagues? They should get more fresh air, do yoga, eat healthily, maybe watch some sitcoms on television.

"This is better than getting themselves and others all worked up when they know very well that the train has already departed and that childish tantrums, tears and hysterics will not help things."