Live coverage: 400th Proton rocket takes off with Russian satellite

Six RD-276 engines powered a Russian Proton rocket off the launch pad Wednesday at the Baikonur Cosmodrome in Kazakhstan, boosting a television broadcast payload for Eutelsat and the first commercial robotic satellite servicing spacecraft into orbit.

The Russian Soyuz MS-03 crew transport spacecraft is launched from the Baikonur Cosmodrome with three passengers on a two-day trek to the International Space Station.

Russian officials postponed the planned launch of a Proton rocket with an X-ray astronomy satellite Friday until no earlier than July 12 resolve a problem with an inadvertently drained battery on the vehicle.