SIHANOUK MEETS MOSCOW LEADERS
confs with Podgorny and Premier Kosygin; illus; Tass communique repts talks included questions of improving relations, were held in 'atmosphere of frankness and friendship'; Western diplomats doubt USSR will make any move that will be considered critical of N Vietnam; Tass gives wide publicity to N Vietnam statement scoring 'right-wing activity' in Cambodia; Soviet press makes no mention of Norodom Sihanouk's criticism of Communists in his country, continues barrage of articles attacking US role; N Vietnamese press agency repts Hanoi has proposed meeting with Cambodia to settle their differences