on Oct. 4, 1963, the prime ministers of Iraq and Kuwait met and signed an agreement wherein "the Republic of Iraq recognizes the independence and complete sovereignty of the State of Kuwait" and the boundary between them.

But on Oct. 4, 1963, the prime ministers of Iraq and Kuwait met and signed an agreement wherein "the Republic of Iraq recognizes the independence and complete sovereignty of the State of Kuwait" and the boundary between them. The agreement was deposited with the United Nations, which published it with Kuwait's certificate that it was intended to take effect upon signature. https://www.nytimes.com/1994/11/17/opinion/l-iraq-recognized-kuwait-s-borders-in-63-852589.html A treaty was signed in Baghdad by Iraq's new Prime Minister, Ahmed Hassan al-Bakr, and Kuwait's Prime Minister, Sheikh Sabah Al-Salim Al-Sabah. Iraq renounced territorial claims to Kuwait and the two nations agreed to establish diplomatic relations immediately.[16] https://en.wikipedia.org/wiki/October_1963#October_4,_1963_(Friday) Noting that Iraq and Kuwait, as independent sovereign States, signed at Baghdad on 4 October 1963 "Agreed Minutes Between the State of Kuwait and the Republic of Iraq Regarding the Restoration of Friendly Relations, Recognition and Related Matters", thereby recognizing formally the boundary between Iraq and Kuwait and the allocation of islands, which were registered with the United Nations in accordance with Article 102 of the Charter of the United Nations and in which Iraq recognized the independence and complete sovereignty of the State of Kuwait within its borders as specified and accepted in the letter of the Prime Minister of Iraq dated 21 July 1932, and as accepted by the Ruler of Kuwait in his letter dated 10 August 1932, Conscious of the need for demarcation of the said boundary, http://hrlibrary.umn.edu/peace/docs/scres687.html On February 8, 1963, Qasim was overthrown in a coup carried out by the Arab Socialist Resurrection (Ba'th) Party. The new Ba'thist government in Baghdad (in which Saddam Husayn, ironically, was ajunior figure) described Qasim's attitude toward Kuwait as erroneous, and on October 4, Iraq recognized Kuwait's independence.' On May 14, 1963, Kuwait became the 111th member of the United Nations. https://li.proquest.com/elhpdf/histcontext/CRS-1991-FND-0006.pdf