Political violence in Ukraine continued to imperil the United States national team’s friendly against Ukraine, which is scheduled to be played in the eastern city of Kharkiv in March but seems increasingly likely to be played elsewhere — if at all.

Deadly fighting between protestors and riot police on Thursday in Kiev raised the prospect that Ukraine’s president, Viktor F. Yanukovych, would declare a state of emergency, bringing the armed forces to bear in protests that have killed dozens. The violence this week forced the relocation of Dynamo Kiev’s Europa League game against Spain’s Valencia to Cyprus, where Valencia won, 2-0. But another Ukrainian club, Dnipro, beat visiting Tottenham, 1-0, in Dnepropetrovsk, about 240 miles southeast of Kiev, on Thursday. A moment of silence was held before that game.

A U.S. Soccer spokesman said the federation was communicating with its counterparts in Ukraine and would consider “all available options,” including moving the game or even canceling it. “The safety of the players and coaches is always our first priority,” he said.

But calling off the game seems unlikely. The March 5 match date, an international friendly day designated by FIFA, is the only one before May when the United States can field a team of its European-based regulars, most of whom have not been in national team camp since November. The United States has scheduled an April 2 game against Mexico in Glendale, Ariz., but since it does not fall on an official FIFA matchday Coach Jurgen Klinsmann cannot demand that European clubs release their American players.