US citizens face growing danger as government advises swift departure from one country

The alert says tourists who decide to go to Russia should "be ready for the possibility of detention for an unknown amount of time." As tensions increase between Thailand and Cambodia, for example, the government warned Americans about traveling to the border area of the two countries. "U.S. citizens should avoid all travel within 50 kilometers [about 31 miles] of the Thailand-Cambodia border, due to active hostilities and the unpredictable security situation," the alert said.