Russian President Vladimir Putin said after his meeting with North Korean leader Kim Jong Un on Thursday that North Korea would need security guarantees before it could pursue nuclear disarmament.

Putin, who did not elaborate on what kind of guarantees Kim wanted, said Russia supported the US call for complete denuclearization of the Korean Peninsula. "This is certainly a common priority," he said.

The Russian president also said he was prepared to discuss what was covered at the summit with the United States.

"There are no secrets here, no conspiracies... Chairman Kim himself asked us to inform the American side of his position," Putin said.

Earlier, Putin bade farewell to Kim outside the venue of their meeting in Vladivostok, after holding talks that were rounded off with a reception toast.

"Ceaselessly bolstering and developing strategic and traditional relations between North Korea and Russia ... is my and my government's firm and unwavering position," Kim said.

The summit was the first face-to-face meeting between the two leaders and Kim's first official visit to Russia. It came some two months after much anticipated talks with US President Donald Trump broke down in Vietnam.

Kim had arrived in the Russian border town of Hasan in his armored train on Wednesday before continuing his journey to Russia's far eastern city of Vladivostok.

Kim is scheduled to leave Vladivostok on Friday. Parallel to Kim's visit to Russia, Pyongyang slammed the ongoing US-South Korean air force drills and threatened a "corresponding response."

While North Korea regards China as its key ally, ties between Pyongyang and Moscow stretch back to the early Cold War, when North Korea was heavily reliant on support from the Soviet Union.

Kim Jong Un's grandfather, the first and "eternal" president Kim Il Sung, was installed as North Korean leader by the Soviet Union in 1948.

dj,rc/amp (Interfax, AFP, AP), dpa, Reuters)

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