Putin could not wait long enough to hold the military parade, so the new date is announced even as the number of COVID19 cases in Russia remains high (over 8k cases for the last 24 hours).
Moreover, march of Immortal Regiment, which Putin himself explained as being highly dangerous as a source of mass infection, also was rescheduled and will be held in full.
Such disregard for safety and health of the citizens in the name of militarism and glorification of imperialist tendencies is directly out of the Soviet handbook.