Former US presidential candidate Senator John McCain and Speaker of the House of Representatives John Boehner are among the nine Americans banned from Russia under sanctions imposed by Moscow.
Russia announced sanctions against US officials in retaliation against US visa bans and asset freezes.
White House Correspondent for CQ Roll Call Steven Dennis tweeted the full list of Americans who have been banned by Russia:
An unusually frank Nato Secretary General issued an unequivocal warning on the course of events should Russia attack Latvia or Estonia.
The West responds with sanctions and closer political ties with Ukraine as Russia's President seals the annexing of Crimea to much fanfare.
Supporters of the controversial fracking industry believe shale gas could be America's most potent weapon in the stand-off with Russia.