By Carolyn Cohn LONDON (Reuters) – Prospects of peace talks between Russia and Ukraine, Chinese stimulus and an imminent U.S. interest rate rise lifted stocks and U.S. Treasury yields on Wednesday. Russia and Ukraine both emphasised new-found scope for compromise on Wednesday as peace talks were set to resume three weeks into a Russian assault that has failed to topple the Ukrainian government by force. China’s Vice Premier Liu He said Beijing will roll out more measures to boost the Chinese economy, as well as favourable policy steps for capital markets. “There is some positive noise about th…