THE WHITE HOUSE ON THURSDAY REJECTED AN INVITATION FROM NORTH KOREA FOR THE CHIEF U.S. ENVOY TO STALLED NUCLEAR TALKS TO VISIT PYONGYANG, REUTERS REPORTED. "THE UNITED STATES IS NOT GOING TO ENGAGE IN BILATERAL NEGOTIATIONS WITH THE GOVERNMENT OF NORTH KOREA," SAID WHITE HOUSE SPOKESMAN TONY SNOW, SAYING WASHINGTON WAS STICKING TO ITS POSITION THAT ANY NEGOTIATIONS BE CONDUCTED THROUGH A SIX-NATION FORMAT.