North Korean leader Kim Jong Un could hold his first meeting with Russian President Vladimir Putin as early as next week amid stalled nuclear talks with the United States, media reports have said.

A senior Russian diplomat has confirmed that preparations are underway for a summit between Putin and Kim, South Korea's Yonhap news agency reported Tuesday, citing the country's vice foreign minister, Cho Hyun.

Cho said Monday that his Russian counterpart, Vladimir Titov, had reiterated the Kremlin's earlier announcement that Moscow has long been preparing for the first summit between the two leaders.