Britain is sending tanks, drones and 800 troops to Estonia as part of the biggest military build-up on Russia's borders since the Cold War. The soldiers will be sent to the Eastern European country and will be joined by forces from Denmark and France, according to Defence Secretary Michael Fallon. It comes a day after Russia unveiled chilling pictures of its largest ever nuclear missile - Satan 2 - which is capable of obliterating the UK. The United States hopes for binding commitments from Europe to fill four battle groups of some 4,000 troops, part of NATO's response to Russia's...