The new START treaty between Russia and the US has finally come into effect, with papers exchanged in Munich between Foreign Minister Sergei Lavrov and US Secretary of State Hillary Clinton over the weekend, limiting warheads on each side to 1,550.  The agreement brings the two sides closer to ensuring that the button that ‘would unleash nuclear destruction […] will never be pushed‘, Clinton said (click for video).  New Wikileaks indicate that Russia’s support for the treaty was secured by the US promising to share information on Britain’s nuclear capability. ‘[T]he question now is where Obama is going with his disarmament project,‘ says The Guardian.  Doku Umarov, the leader of Russia’s Islamist rebel movement, has issued some strong rhetoric about 2011 being a year of ‘blood and tears‘ for Russia if it does not withdraw from the North Caucasus, but stopped short of claiming responsibility for the Domodedovo suicide bombings.  Officials believe that they have discovered the bomber’s identity, naming 20-year-old Ingushetian Magomed Yevloyev, and placing two further names on a wanted list.  The Japanese Prime Minister is still seething over the ‘unforgivable outrage‘ of Medvedev’s visit to the Kuril islands, designating February 7 as ‘Northern Territories Day‘ and demanding that the islands still held by Russia be returned.  Right-wing campaigners in Toyko ‘dragged the Russian flag along the ground‘ in protests earlier today.