A pair of American B-52H bombers was escorted by two Japanese F-2 fighter aircraft and two South Korean KF-16 fighter jets during a trilateral flight on Friday.

Russian Foreign Minister Sergey Lavrov traveled to North Korea on Friday to meet with his North Korean leader Kim Jong Un and others during a three-day visit.

It was reported last week that North Korea plans to triple the number of troops fighting with Russia along the front lines in Ukraine—sending an additional 25,000-30,000 troops. Troops will arrive in the next few months, adding to the 11,000 North Korean troops that were sent in November.