NATO General Secretary Jens Stoltenberg has said "Putin underestimated Ukrainians when he invaded Ukraine, but he also made a big strategic mistake of underestimating NATO and NATO allies." On Wednesday, Germany and the US mobilised tanks to be sent to Ukraine - a move Russia declared to be a "new level of confrontation". Report by Wardl. Like us on Facebook at http://www.facebook.com/itn and follow us on Twitter at http://twitter.com/itn