North Korean leader Kim Jong Un is on his way home on Sunday from Russia, ending a six-day trip that triggered global concerns about weapons transfer deals between the two countries locked in separate standoffs with the West.

Kim’s armored train departed to the sound of the Russian patriotic march song “Farewell of Slavianka” at the end of a farewell ceremony at a railway station in Artyom, a far eastern Russian city about 200 km from the border with North Korea, Russia’s state news agency RIA reported.