Ukrainian protesters have been seeking constitutional reforms that would weaken the president's powers in response to President Viktor Yanukovych's rejection of a trade deal with the European Union in favor of closer ties with Russia. The protests in Kiev have led to clashes with police, resulting in at least six deaths and over 1,000 injuries. The political opposition is led by Arseniy Yatsenyuk and is calling for constitutional changes to establish a parliamentary system and reduce the president's control over the government. The European Union is considering economic measures to support Ukraine's economy but wants the crisis to be resolved before providing assistance.