By Shreyashi Sanyal and Anisha Sircar (Reuters) – European shares retreated after three straight sessions of gains on Wednesday, as investors paused to take stock of the outcome of Russia-Ukraine peace talks. The STOXX 600 closed at levels hit before the conflict on Tuesday after peace talks between Russia and Ukraine yielded the most tangible sign of progress toward negotiating an end to the war. “(The recent) relief rally, which has been all about the possibility of an agreement between Russia and Ukraine, has fizzled out today,” said Danni Hewson, financial analyst at AJ Bell. Russian force…