Answer :
The Soviets blockaded Berlin to maintain control and prevent Western influence after introducing a new currency. The Berlin Airlift countered the blockade, leading to the lifting of the blockade and eventually, the construction of the Berlin Wall.
The Soviets blockaded Berlin after WWII to maintain control over the city and to counter the moves by the Western allies who were planning to unite their occupation zones and introducing a new currency, the Deutsche Mark, to facilitate economic recovery with the help of the Marshall Plan. The blockade was an attempt to keep Germany divided and to prevent the success of Western capitalist influence within the Soviet sphere of influence, especially since Berlin was deep within the Soviet-controlled zone of Germany.
Stalin's blockade was meant to force the Western powers to abandon their sectors of Berlin, which Stalin perceived as a threat to the Soviet's ideological and territorial control.
However, the United States, Britain, and France responded with the Berlin Airlift, supplying the city by air and demonstrating their commitment to defending West Berlin and countering Soviet aggression. Eventually, the Soviets lifted the blockade, but the incident escalated into the construction of the Berlin Wall, further solidifying the division of Germany and the start of the Cold War.
