Two Russian astronauts left the International Space Station (ISS) on Monday for a spacewalk expected to last more than six hours, dpa reported. Oleg Artemyev and Alexander Skvortsov are carrying out the spacewalk in order to deploy a so-called nanosatellite to the exterior of the ISS, the ground control centre outside Moscow said according to Interfax. The 1.5-kilogramme Peruvian satellite is supposed to transmit pictures of the Earth, NASA said. The ISS is currently manned by three Russians, two Americans and one German.