His next mission, in 1978, was Soyuz 28, the first Interkosmos flight, where he was accompanied by Vladimír Remek from Czechoslovakia.
Bir sonraki görevi, 1978'de, Çekoslovakya'dan Vladimir Remek'in eşlik ettiği ilk Interkosmos uçuşu olan Soyuz 28 idi.