Russian President Vladimir Putin on Wednesday said he is prepared to discuss a way out of the Ukraine crisis with the head of the Organization for Security and Cooperation in Europe. "I know that you have your own proposals, your ideas of how to find a way out of the situation that has occurred" in Ukraine, Putin was quoted as saying ahead of talks with OSCE chief Didier Burkhalter. "Let's try to analyze the situation and seek ways out of the crisis," Putin said. U.S. stock index futures added to modest gains, while Treasury prices declined after the remarks. News reports said fresh fighting broke out in Ukraine as government forces pushed into the pro-Russian city of Mariupol, where Ukrainian troops temporarily seized control of the city hall from pro-Russian activists but then withdrew.