The U.S. State Department on Sunday warned Americans not to travel to Russia, due to mounting tensions along the border with Ukraine.
The statement added Americans could also face “harassment” and said the embassy would have “limited ability to assist U.S. citizens.”
It also ordered the families of diplomats in the capital Kyiv to leave the country, due to the threat of a Russian invasion.
President Joe Biden is considering sending troops to the region.
The Ukrainian Defense Ministry says Russia has more than 127,000 troops in the area.
NATO said it is reinforcing eastern Europe with more ships and fighter jets.