Nikita Khrushchev announced Expressing_publicly the end Process_end of a three-year moratorium on nuclear testing Testing on August 30 , 1961 , and Soviet tests recommenced Process_start on September 1 , initiating Process_start a series of tests Testing that included Cause_to_be_included the detonation of Tsar Bomba .

The Soviet Union , on the other hand , were experiencing Perception_active political changes Change of their own as Nikita Khrushchev was removed Removing from power .

As leader of the Soviet Union , Khrushchev had begun Process_start the process of disengagement from Vietnam by reducing Cause_change_of_position_on_a_scale economic and military aid Assistance to North Vietnam .

However , in the aftermath Catastrophe of Khrushchev 's downfall Change_of_leadership , the Soviet government had to redefine Change their role in Southeast Asia , particularly in Vietnam , to compete Competition with the growing Cause_change_of_position_on_a_scale influence of the People 's Republic of China .

However , with Kosygin still in Hanoi during the U.S bombing Attack , the Soviet government decided Deciding to step up their military aid Assistance to North Vietnam , thereby signalling Communication a major reversal Change of Khrushchev 's policy in Vietnam .

The incident Scrutiny occurred Coming_to_be during the presidency of Dwight D. Eisenhower and the premiership of Nikita Khrushchev , around two weeks before the scheduled opening Social_event of an east–west summit Social_event in Paris .