WARNING TO REDS; Commitment to Laos and South Vietnam Called Unlimited
US warns Asian Communists to leave their neighbors alone or face wor with US; publicizes decision in order to alert allies and Amers to hardening of its attitudes and commitment for support of whole region; seen also signaling to USSR that it cannot ignore drift towards war in Asia and must try to redeem Khrushchev pledges at June '61 conf with Pres Kennedy