Since travelling to Russia last Tuesday in his first overseas trip in more than four years, Mr Kim has met President Vladimir Putin and visited key military and technology sites.
Kim Jong Un is heading back to North Korea after a six-day visit to Russia where he had talks with Vladimir Putin on forging closer ties – including militarily.
The leader’s armoured train left after a farewell ceremony at a railway station in Artyom, a far eastern Russian city about 124 miles (200km) from the border with his country.
Russia’s minister of natural resources Alexander Kozlov and Primorye regional governor Oleg Kozhemyako attended the gathering, which also featured a Russian military band playing both nations’ national anthems as well as the Russian patriotic march song Farewell of Slavianka.
Before leaving, Mr Kim was reportedly presented with five kamikaze drones and a bulletproof vest as a gift.
Governor Kozhemyako also handed the leader anti-thermal imaging clothes and a reconnaissance drone, Russia’s state media agency Tass reported.
Since travelling to Russia last Tuesday on his first overseas trip in more than four years, Mr Kim has met President Vladimir Putin and visited key military and technology sites.
Mr Kim pledged his support to Russia in what he has described as the “fight against imperialism”.
The trip sparked global concerns that there could be weapons deals between the two countries which are locked in separate stand-offs with the West.
