It was a 5,600-kilogram (12,300 lb) Luna E-8-5 spacecraft, the first of at least eleven to be launched.
[2][3] It was intended to perform a soft landing on the Moon, collect a sample of lunar soil, and return it to the Earth.
It was, along with Luna 15, one of two unsuccessful missions which had been launched by the Soviet Union in a last-ditch attempt to upstage the Apollo 11 landing under Moon race.
[2] Luna E-8-5 No.402 was launched at 04:00:07 UTC on 14 June 1969 atop a Proton-K 8K78K carrier rocket with a Blok D upper stage, flying from Site 81/24 at the Baikonur Cosmodrome.
[1] No Luna spacecraft or Proton rocket was launched on that date.