In 2013, Russia lost three GLONASS satellites when their launch aboard a Proton-M rocket went awry, sending the satellites crashing into the Baikonur Cosmodrome in Kazakhstan instead of aloft into space. Before that, in 2010, three other GLONASS satellites ended up in the Pacific Ocean aboard a Proton-M rocket.
This week, on May 15, another Proton-M satellite crashed, this time with the Ekspress-AM4R telecommunications satellite aboard.
Launch of the Proton-M rocket took place from Launch Pad 39 at the Baikonur Cosmodrome at 21:42 GMT. However, an unspecified failure was noted during third stage flight. The rocket and satellite are lost, according to a NASA Spaceflight article.