<br/>Two Russian cosmonauts and an American astronaut blasted off today for a re-supply and re-staffing mission to the International Space Station. The Soyuz rocket lifted off on schedule from Russia's Baikonur cosmodrome in the Kazakh steppe at 0404 GMT carrying US astronaut Tracy Caldwell Dyson and Russian cosmonauts Alexander Skvortsov and Mikhail Korniyenko. The mission is one of the last launches by a Soyuz rocket to the ISS before the US space shuttle programme is mothballed later this year, after which responsibility for travel to the station falls entirely on the Russian rockets.<br/>