A week ago special services of North Korea confiscated all the mobiles from local enterprises and individuals.
Mobiles are expensive in Korea ($300-500), but the authorities did not refund the people the cost of the phones.
At the same time, foreigners being in North Korea have been allowed to purchase and use mobile phones, but the cost of this service is expensive: about $2,000.
According to the sources, North Korean authorities banned mobiles for the country citizens to restrict their communications with foreigners. It was hard for North Korean special services to overhear all conversations as more and more people were using mobiles.
If one assumes that the two people who gave the interview indeed work for Russian special services, then they acted very unprofessionally and risky
Representatives of the Russian Defence Ministry said that the missile that shot down the passenger Boeing 777 aircraft over the Donbass on July 17, 2014, was manufactured in 1986