North Korean leader Kim Jong Un continued his days-long trip to Russia Friday, visiting an aircraft plant in the eastern city of Komsomolsk-on-Amur, according to Russian state media, after the 2 sides said military cooperation was a possibility, writes CNN.

The facility is the country’s largest aviation manufacturing plant and builds and develops warplanes for the Ministry of Defense, including the Su-35S and Su-57 fighter jets,. Kim’s late father, Kim Jong Il, also visited the plant in 2002.

Images showed Kim and his delegation at the Yuri Gagarin Komsomolsk-on-Amur Aircraft Plant (KnAAZ), which is named after the famed Russian cosmonaut, and being shown the inside of a fighter jet.

The North Korean leader is also expected to travel to the port city of Vladivostok where he will view the military capabilities of Russia’s Pacific Fleet, Russian President Vladimir Putin told state news agency Russia 1.

The tour of key sites in the Russian Far East region came after Putin said Russia is considering and discussing some military cooperation with North Korea, following a summit at which Kim appeared to endorse Moscow’s war on Ukraine.