Britain steps up Ukraine warnings despite assurance from Moscow

Analysis: evidence contrasts with statements from Russia that troops are being sent back to barracksRussia and Ukraine crisis latest news: live updates as US warns of Russian invasionBritain believes that nearly half of Russian forces that have massed near Ukraine are now within 30 miles of the border, in contrast to statements from Moscow that its forces were being sent back to barracks.Reinforcements from 14 battalions were in the process of arriving, officials added, while highlighting a pont