The United Nations Security Council Resolution 434 was decided on September 18th, 1978 and the resolution was not adopted.
United Nations Security Council Resolution 434, adopted on September 18, 1978, after reaffirming previous resolutions, including 425 (1978), 426 (1978) and 427 (1978), the Council commended the United Nations Interim Force in Lebanon for its work in Southern Lebanon, but expressed concern for the situation in Lebanon as a whole. 
