But he added that Moscow doubts the North could be persuaded to fully abandon its nuclear weapons, considering that a "mission impossible".
North Korea has increasingly expressed frustration at the deadlocked negotiations. By early 1950, Kim Il Sung successfully persuaded an initially reluctant Joseph Stalin to allow him to unify the Koreas by force, guaranteeing a swift victory.
Kim was expected to return to Pyongyang on Friday.
Howard Feldman told RT that immediately upon Kim's arrival in Russian Federation, there was already much to make of the leader's demeanor.
Russian Federation has provided some $25 million in food aid to North Korea in recent years, according to the Kremlin. Russian Federation opposes the west's sanctions-led approach but also, like China, wants to see North Korea roll back its nuclear efforts.
That would mean including Russia, China, Japan and South Korea as well as the United States and North Korea, a long-standing format that has been sidelined by unilateral USA efforts to broker a deal. There were widespread predictions that a collapse of the North Korean government was imminent. Putin has welcomed Mr. Trump's meetings with Kim, but urged the U.S.to do more to ease Pyongyang's security concerns. North Korea has test-fired a "new-type tactical guided weapon", its state media announced Thursday.
He did not respond to reports saying his North Korean counterpart in previous talks, Kim Yong Chol, had been sidelined since Hanoi.
Pyongyang pulled out from the talks on April 14, 2009, and announced that it would resume its nuclear program. The divergence between Moscow and the West over key security issues was also becoming clear.
Kim, who had arrived in Vladivostok a day earlier on board his armored train, told Putin the meeting would help strengthen and develop ties between Russian Federation and North Korea, which share a long history of friendship.
"I came to Russian Federation with the warm sentiments of our people I hope that this visit will be successful and useful", Kim said.
The summit echoes a similar one held by Kim's father, Kim Jong Il, with Putin in 2011.
The meeting, convened amid ongoing peace negotiations between the two countries, was eventually cut short after the two sides failed to reach an agreement about lifting sanctions in exchange for the halting and eventual dismantlement of the country's aggressive nuclear program.
The Russia trip comes after Kim gave a speech at the country's rubber-stamp parliament this month where he said he is willing to meet Trump again as long as the US offers acceptable terms for a deal by year end.
With Kim frustrated over the impasse, Putin has seized an opportunity to try and expand Russia's clout in the region and get more leverage with Washington by trying to rekindle the diplomacy.
In addition to scheduling a summit with Putin, whose Russian Federation has played host to an estimated 30,000 North Korean workers, most of whose earnings are repatriated to the impoverished country - and its not-so-impoverished rulers - recent reminders have included a well-publicized visit by Kim to an airbase and a test, supervised by Kim, according to state media, of "a new tactical guided weapon".
The summit with Kim could also serve Putin's desire to increase Russia's regional clout.
Before the meeting, Putin said he welcomed the normalization of relations between the US and North Korea.
Mr Kim praised the summit as a "very meaningful one-on-one exchange".
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