What caused the soviets to stop the blockade?

The Soviet Union lifted the Berlin Blockade in May 1949 primarily due to the realization that it was not achieving its objectives of forcing the Allies out of West Berlin and that the situation was escalating tensions with the West. The success of the Berlin Airlift by Western Allies demonstrated their commitment to defending the city and provided critical supplies to West Berliners, undermining the effectiveness of the blockade. Additionally, the economic strain on the Soviet Union and a shift in strategy towards a more diplomatic approach contributed to their decision to end the blockade.