VANCE SAYS THE U. S. WON'T BE STRIDENT OVER RIGHTS ABROAD
State Sec Cyrus Vance says '77 is âcriticalâ yr for Middle East, news conf; believes new Geneva conf should be held in consultation with USSR; does not want to make any policy suggestions until after he has consulted with Israeli and Arab leaders; says PLO must accept Israel's existence and pertinent UN resolutions before Israel or US will deal with it (M)