Mission Reports Roscosmos: Design flaw brought down Proton rocket June 1, 2015 Stephen Clark Russia has blamed a design flaw in the Proton rocket’s third stage that went undetected for decades as the cause of a May 16 launch failure.
Mission Reports Live coverage: Proton launch runs into trouble May 15, 2015 Stephen Clark Russia’s Proton rocket launched from Kazakhstan at 0547 GMT (1:47 a.m. EDT) Saturday with Mexico’s Centenario communications satellite, but the Russian space agency reported an anomaly occurred some time after liftoff.