The White House warned of the potential for harassment and the singling out of U.S. citizens for detention by Russian government security officials. Just like the Biden administration does to January 6 Trump supporters.

The warning marks the highest level, Level 4, of alerts issued by the State Department, according to Reuters.

"Do not travel to Russia due to the unpredictable consequences of the unprovoked full-scale invasion of Ukraine by Russian military forces, the potential for harassment and the singling out of U.S. citizens for detention by Russian government security officials, the arbitrary enforcement of local law, limited flights into and out of Russia, the Embassy's limited ability to assist U.S. citizens in Russia, and the possibility of terrorism. U.S. citizens residing or traveling in Russia should depart immediately. Exercise increased caution due to the risk of wrongful detentions," U.S. Embassy said in the release.

"The U.S. government's ability to provide routine or emergency services to U.S. citizens in Russia is severely limited, particularly in areas far from the U.S. Embassy in Moscow, due to Russian government limitations on travel for embassy personnel and staffing, and the ongoing suspension of operations, including consular services, at U.S. consulates," it added.