This fall, North Korea also sent troops to participate in the war on Russia's side, as confirmed by Ukrainian military intelligence.Because North Korea and Russia do not publish official statistics on the country's bilateral trade, there is uncertainty. But even the minimum estimate of shipments is over $1.7 billion, the study reads.North Korea's revenues could increase by "hundreds of millions of dollars," as Pyongyang will receive money for sending soldiers. Meanwhile, the deployment of more than 20,000 North Korean soldiers seems "unlikely," as it could jeopardize the stability of the North Korean regime. The risk of desertion and human resource constraints also stand in the way, according to the research.The tightening of relations between Russia and North Korea is also reflected in "a notable rise" in diplomatic visits.