Pimen I's task thus came to lead a Christian church in a state ruled by an officially atheist Communist party. In his post he worked closely with the authorities: he participated in numerous 'peace movement' conferences sponsored by the government. Pimen was awarded Medal of Soviet Peace Fond (1969, 1971) and in 1970 Golden medal "Борцу за мир" ("For Fighter for Peace") by the 'Soviet Committee for the Defence of Peace'. Pimen was a member of the World Peace Council from 1963 on. In 1961, Pimen was awarded the Order of the Red Banner of Labour (орден Трудового Красного Знамени), one of the higher awards of the time. The Soviet state tried to limit and control all religious activity and Pimen struggled to ensure the survival of the Russian Orthodox Church.citation needed
At the end of his difficult term as the head of the Russian Orthodox Church he organized the celebration of the 1000th anniversary of the Baptism of Rus' in Russia in 1988. This event became the historic moment that marked the end of persecution of Orthodox Christianity in the Soviet Union.citation needed