The Security Council,
Recalling its resolutions 598 (1987) of 20 July 1987, 619 (1988) of 9 August 1988, 631 (1989) of 8 February 1989 and 642 (1989) of 29 September 1989,
Having considered the report of the Secretary-General on the United Nations Iran-Iraq Military Observer Group of 22 March 1990 (S/21200), and taking note of the observations expressed therein,
(a) To call once again upon the parties concerned to implement immediately Security Council resolution 598 (1987):
(b) To extend the mandate of the United Nations Iran-Iraq Military Observer Group for a further period of six months, that is, until 30 September 1990;
(c) To request the Secretary-General to submit, at the end of this period, a report on the developments in the situation and the measures taken to implement Security Council resolution 598 (1987).