Pyongyang barred Malaysians from leaving the country, and Malaysia has responded with a ban on North Koreans leaving its midst as well.
Until now, only two pieces of wreckage had been confirmed as being from the jet that disappeared in 2014.
Findings counter Moscow's suggestion that the plane, en route from Amsterdam to Kuala Lumpur, was brought down by Ukraine's military rather than Russian separatists.
Flight MH370 disappeared with 239 people on board on its way from Kuala Lumpur to Beijing in March 2014.
When Obama welcomes Southeast Asian leaders for a shirt-sleeves summit in California, he'll have some interesting dining companions.
Airline safety has improved to the point where there are few fatal accidents, but flight security remains a concern.
Israelis will not attend important meet and the Malaysian foreign minster says lack of diplomatic ties with Israel might be the reason.
Najib Razak denies claims he met Israeli prime minister on purpose, labeling such claims as 'slander'.
But the question of why the aircraft vanished, along with 239 passengers on board, remains unclear.
Confirmation makes it more likely that remains come from Malaysia Airlines flight MH370 that disappeared in March 2014.