U.S. IS RECEPTIVE ON MIDEAST FORCE
Sec Rogers indicates US would consider participating with its troops in a peace-keeping force if Arab countries and Israel succeed in negotiating 'permanent contractual' agreement among themselves, but rules out any force just involving US and USSR forces, news conf; calls situation 'very sensitive' but expresses optimism that negotiations will soon resume; says US has had 'very useful' exchs with Hussein and members of new UAR Govt; other US officials say US actually has reason to believe Jarring talks might be reopened before Jan 5; foreign diplomats in Washington say that if Israel agrees to return to Jarring meetings she will have, in effect, accepted US concept of 'rectification' of truce violations charged to UAR