U.S. Navy Plane Feared Shot Down Off Siberia for Alleged Trespass; NEW PLANE INCIDENT
US Navy P-2-V that failed to return from patrol duty in N Jap waters Nov 6 presumably shot down by USSR fighter planes for alleged violation of USSR territory; USSR disclosed to have protested to US Nov 7; US reptdly regards plane as UN, not US craft; silent; reptdly awaits rept from Ridgway hdqrs; USSR press repts 2 airmen decorated for 'exemplary performance of duty'; similarity to Baltic incident, '50, seen
