Anti-government protesters aim their weapons during clashes with riot police in Independence Square in Kiev February 18, 2014. Ukrainian riot police advanced on Tuesday onto a central Kiev square occupied by protesters, after at least 14 people died in the worst day of violence since demonstrations erupted against President Viktor Yanukovich 12 weeks ago. REUTERS/Vasily Fedosenko (UKRAINE – Tags: POLITICS CIVIL UNREST) – RTX192TK