Another source said that a summit between Putin and Kim could take place before or after the Beijing forum, adding that there have been signals that North Koreans are making preparations for a summit.
South Korean and US officials have said the North Korean regime had ordered the assassination of Kim Jong Nam, who had been critical of his family's dynastic rule.
In a speech delivered to North Korea's rubber-stamp parliament on Friday, Kim said he is open to a third summit with Trump but set an end-of-year deadline for Washington to offer mutually acceptable terms for an agreement. Responding on Twitter, Trump welcomed a third meeting with Kim.
A Vietnamese woman accused of killing the half-brother of North Korean leader Kim Jong Un will walk free on May 3, her lawyer said Saturday. "But U.S. -style dialogue of unilaterally pushing its demands doesn't fit us, and we have no interest in it".More news: Sony’s PS4 successor sports 3D audio tech, faster SSD storage
"Anyway, we will wait for a bold decision from the USA with patience till the end of this year, but I think it will definitely be hard to get such a good opportunity as the previous summit", he added, underscoring a deadline of sorts for the Trump administration.
At their February 27-28 summit in Hanoi, the USA and North Korean leaders fell short of bridging the gap between Washington's denuclearization demands and Pyongyang's calls for sanctions relief.
But the pair always maintained they were innocent pawns in a plan hatched by North Korea and believed they were carrying out pranks for a reality TV show.More news: Search for woman after Columbine 'threat'
Trump, however, said after the Hanoi summit that while North Korea committed to "totally" dismantling its main Yongbyon nuclear complex, the lifting of the sanctions would require Pyongyang to scrap other nuclear facilities and programs, including undeclared ones. In Kim's speech, three core examples of this policy were the United States' refusal to grant sanctions relief, its continuation of modified military exercises with South Korea, and a recent US missile defense test against an intercontinental-range ballistic missile-class target.
While North Korea and the United States have been discussing the North's denuclearization, USA ally South Korea has been taking steps to improve its ties with its old rival.
Kim's speech came after North Korea's Supreme People's Assembly made a slew of personnel changes that bolstered Kim's diplomatic lineup.
Choe also "called for making a dynamic struggle for the prosperity of Juche Korea and accomplishment of the cause of socialism, single-heartedly rallied around Kim Jong Un", KCNA said.More news: Cloud lifting with lots of sunshine sending Easter temperatures soaring
North Korean charge d'affaires in Moscow, Jin Jong Hyuk, said Thursday that Pyongyang expects a number of mutual visits by high-level Russian and North Korean delegations in the future.
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