<p>Although it was never publicly acknowledged during the existence of the Soviet Union, the Soviets did plan a program to land cosmonauts on the Moon comparable to the Apollo landings. Such missions were seen as a logical continuation of the Space Race that had begun when Sputnik was launched in 1957. However, the Soviets were forced to abandon their lunar program following a string of failures from the mid-1960s to early 1970s. The Soviets then attempted to conceal their lack of success by claiming that no such program had ever existed in the first place.</p>