However, just after the atomic bombs exploded over Hiroshima and Nagasaki, Russell wrote letters, and published articles in newspapers from 1945 to 1948, stating clearly that it was morally justified and better to go to war against the USSR using atomic bombs while the United States possessed them and before the USSR did. In September 1949, one week after the USSR tested its first A-bomb, but before this became known, Russell wrote that USSR would be unable to develop nuclear weapons because following Stalin's purges only science based on Marxist principles would be practised in the Soviet Union. After it became known that the USSR carried out its nuclear bomb tests, Russell declared his position advocating for the total abolition of atomic weapons.