Retired U.S. General Mark Hertling dismissed Russia's offer to negotiate over the war in Ukraine, even after Russian President Vladimir Putin expressed readiness to discuss solutions. "On Christmas Eve Putin says he's 'ready to negotiate.' Having 'negotiated' w/ Russian military & Defense Ministry I learned lessons: Even in small things, RU officials don't negotiate...they demand, then they lie, and then they renege on agreements," Hertling tweeted Sunday.