The new travel advisory, updated Monday, warns Americans to avoid all travel to the country due to "increased threats" from Russia amid its military build-up near the border. It warns US citizens to be "aware of reports that Russia is planning for significant military action against Ukraine" - which would lead to a rapidly deteriorated security situation, possibly making it hard to get out.

The advisory also spells out that Americans still choosing to visit the country "should be aware that Russian military action anywhere in Ukraine would severely impact the US Embassy's ability to provide consular services, including assistance to US citizens in departing Ukraine."