On the eve of the shuttle Discovery's launch on a space station resupply mission, a Russian Soyuz spacecraft completed a smooth docking with the international lab complex early Sunday, boosting the station's crew from three to six.

With commander Alexander Skvortsov monitoring a problem-free, automated approach, the Soyuz TMA-18 docked to the International Space Station's new Poisk module at 1:25 a.m. EDT (05:25 GMT) as the two spacecraft sailed 222 miles (355 km) above Kazakhstan.