(Reuters) – Russia successfully test-fired a hypersonic Zircon cruise missile over a distance of about 1,000 km (625 miles), the defence ministry said on Saturday. The missile was fired from the Barents Sea and hit a target in the White Sea, it said. Video released by the ministry showed the missile being fired from a ship and blazing into the sky on a steep trajectory. President Vladimir Putin has described the Zircon as part of a new generation of unrivalled arms systems. Hypersonic weapons can travel at nine times the speed of sound, and Russia has conducted previous test-launches of the Zi…