Violent clashes have erupted during anti-government protests in Ukraine's capital, Kiev, with at least nine people, including two policemen, dead. In the worst violence in weeks, police used rubber bullets and stun grenades as thousands of protesters marching on parliament. A deadline set by the security forces for the violence to end has passed with no immediate sign of police action. The clashes came as MPs were due to debate changes to the constitution. The proposals would curb the powers of President Viktor Yanukovych, but the opposition say they were blocked from submitting their draft, meaning no debate could take...