Russia is warning that new tests of its deadly hypersonic Satan-2 missile are imminent and on the brink of going into 'serial production.' Vladimir Putin's space chief Dmitry Rogozin has been seen inspecting the giant weapon as it was taken into a forest by rail. 'The world's most powerful global-range nuclear-tipped missile is being prepared for new tests and serial production,' said Mr Rogozin. Russia state TV and politicians have regularly suggested deploying the missile during the Ukraine crisis.