S Secretary of State Antony Blinken has said Washington has made no concessions to the main Russian demands over Ukraine and NATO, in a written response delivered to Moscow The letter from the US is its formal response to Russian demands that include NATO's withdrawal from eastern Europe. Russia has massed around 100,000 troops on the border with Ukraine. It’s calling on the country to be barred from NATO membership. Huw Edwards presents BBC News at Ten reporting by Sarah Rainsford in Ukraine’s capital Kyiv, and Barbara Plett Usher in Washington. Please subscribe HERE http://bit.ly/1rbfUog #BBCNews