Armed men, believed to be Russian troops, stand on guard outside a military base in Perevalnoye, near the Crimean city of Simferopol March 21, 2014. Russian shares fell sharply on Friday as investors took fright at tougher than expected U.S. sanctions against President Vladimir Putin’s inner circle over Moscow’s seizure of Crimea from Ukraine. REUTERS/Shamil Zhumatov (UKRAINE – Tags: POLITICS MILITARY) – RTR3I0KT