What was the objective of Star Wars Treaty during Cold War?

The Star Wars Treaty, formally known as the Strategic Defense Initiative (SDI), aimed to develop a missile defense system to protect the United States from nuclear missile attacks, particularly from the Soviet Union. Proposed by President Ronald Reagan in 1983, the initiative sought to use advanced technologies, including space-based systems, to intercept and destroy incoming missiles. Its objective was to provide a defensive shield that would deter nuclear conflict and shift the focus from offensive nuclear capabilities to defense, thereby altering the balance of power during the Cold War. However, the initiative faced significant criticism and skepticism regarding its feasibility and cost.