Kim Jong Un, accompanied by the defense minister of Russian President Vladimir Putin, examined Russian strategic bombers and hypersonic “Kinzhal” missiles.

Sergei Shoigu, Russia’s defense minister, saluted a beaming Kim as he arrived at the Russian city of Knevichi, which is roughly 50 kilometers (30 miles) from the Pacific port of Vladivostok. Kim then looked over a guard of honor.

Shoigu then showed Kim Russia’s strategic bombers – the Tu-160, Tu-95 and Tu-22M3 – which are capable of carrying nuclear weapons and form the backbone of Russia’s nuclear air attack force.

“It can fly from Moscow to Japan and then back again,” Shoigu told Kim of one of the aircraft.

Kim was shown asking about how the missiles were fired from the aircraft. A Russian official told him that the strategic bombers were one of the key parts of Russia’s nuclear forces.

Kim on Friday inspected a Russian fighter jet factory that is under Western sanctions, part of a visit Washington and its allies fear could strengthen Russia’s military in Ukraine and bolster Pyongyang’s missile program.

Russian President Vladimir Putin and Kim discussed military matters, the war in Ukraine and deepening cooperation when they met on Wednesday.

Putin told reporters Russia was “not going to violate anything”, but would keep developing relations with North Korea. His spokesman said no agreements had been signed during Kim’s visit on military issues or any other topic.