The convoy was part of international aid efforts after a devastating quake struck the war-torn country.
Pyongyang had been thought to be building copies of US drones.
A series of top-level visits may pave the way for trade deals and investment.
Video: China launches military drills near Taiwan
Survivors include a grandmother and 2 teens in Mandalay who captured their ordeal on a cell phone.
Video: 13-year-old rescued from collapsed monastery in Mandalay, Myanmar
Tibetan children as young as 6 are subjected to military training; political and patriotic education
Video: Woman rescued from building in Naypyidaw after Myanmar earthquake.
Video: Myanmar residents sleep outdoors after earthquake
Junta leader Min Aung Hlaing said the death toll is approaching 3,000.
