Russian President Vladimir Putin said that North Korean leader Kim Jong Un wants to denuclearize but needs "security guarantees" to do so.

Speaking after a high-profile summit with Kim, Putin said Russia favored denuclearization on the Korean Peninsula and Kim agreed, but said bilateral security guarantees were not enough.

Putin said he didn't know if it was time to resume six-way talks with North Korea to end a standoff over its nuclear weapons program. The "six-party talks" had taken place between North and South Korea, the U.S., Japan, Russia and China in the early 2000s, but collapsed in 2009 when North Korea pulled out, saying it would resume its nuclear enrichment program in order to boost its nuclear deterrent.

Putin said Thursday that a resumption of such talks "will help provide international security guarantees," Reuters reported.

Earlier Thursday, Putin had said he had a "substantial discussion" with North Korean leader Kim Jong Un about the Korean Peninsula Thursday, but gave little detail.

He said he and Kim exchanged views on how to improve the situation in the region, Reuters reported. Kim, meanwhile, reportedly said both leaders discussed how to "strategically improve regional stability."

"We just had a thorough face-to-face conversation," Putin said, according to Russian news agency Tass.