Why didn't the soviet union invade Finland after WW2?

The Soviet Union did not invade Finland after World War II primarily due to the 1948 Treaty of Friendship, Cooperation, and Mutual Assistance, which established a formal relationship between the two countries and guaranteed Finland's sovereignty. Additionally, Finland had successfully maintained its independence during the war and demonstrated a willingness to align with Soviet interests without direct military intervention. The Soviet leadership also recognized the potential for international backlash and the importance of maintaining stability in the region.