Soviet space program

Alexei Leonov was a Soviet cosmonaut who flew Voskhod 2 (the first spacewalk) and commanded the Soviet side of the Apollo-Soyuz Test Project.

Valentina Tereshkova was a Soviet cosmonaut who flew Vostok 6 in 1963, the first woman in space.

Yuri Gagarin was a Soviet cosmonaut who flew Vostok 1 in 1961, the first human in space.

Buran, the Soviet reusable spaceplane that flew one uncrewed orbital flight in 1988, was developed and operated by the Soviet space program.

Luna 9, which achieved the first soft landing on the Moon in 1966, was a Soviet space program mission.

Mars 3, which achieved the first (brief) soft landing on Mars in 1971, was a Soviet space program mission.

Covers Mir's 1986-1991 Soviet-era operation only; Roscosmos (kept, separate edge) covers 1991-2001.

Salyut 1, the world's first space station (1971), was launched and operated by the Soviet space program.

Covers Soyuz's original 1967-1991 Soviet-era development and operation; Roscosmos (kept, separate edge) covers 1991-present.

Venera 13, which returned the first color images from the surface of Venus in 1982, was a Soviet space program mission.

Venera 7's own infobox names Lavochkin, the Soviet design bureau that built the probe, as Operator; Lavochkin is not itself a modeled agency entity in this atlas (EntityRequest 622), so this edge targets the overarching Soviet space program, which the lead paragraph confirms as the mission's state origin.