he spoke after the ukrainian ambassador to the uk had suggested that his nation might make serious concessions and be flexible over its plan to join the military alliance. ukraine has demanded a meeting with russia within the next 48 hours to discuss the build—up of over 100,000 russian troops on its border — but the kremlin has repeatedly denied any intention of an attack. 0ur political correspondent jonathan blake has the latest. russian military manpower and firepower on the border with ukraine, proof in plain sight, the us claims, that president putin is preparing for war. american forces arrived in the region yesterday in a show of support to western allies. it's feared military action could come any day, and for the uk, the crisis has reached a criticaljuncture. downing street say the prime minister will continue to receive daily intelligence briefings, speak to more world leaders about the crisis in the coming days