Russian President Vladimir Putin said on Thursday that he was ready to compromise over Ukraine in possible talks with U.S. President-elect Donald Trump on ending the war and had no conditions for starting talks with the Ukrainian authorities. Trump, a self-styled master of brokering agreements and author of the 1987 book "Trump: the Art of the Deal", has vowed to swiftly end the conflict, but has not yet given any details on how he might achieve that.