WASHINGTON SAYS SOVIET PACT PLAN IS NOT OBJECTIVE'; Offer to Bar the Use of Force Is Not Considered Serious, but a Study Is Promised; PROPAGANDA MOVE SEEN; Officials Cite Russians' Call for Ending West's Bases as an Unacceptable Idea;
US calls proposal 'not objective,' does not regard it as serious diplomatic venture but pledges study; Rusk confs with Johnson; Brit unimpressed; French, W Gers defer comment