This is the best summary I could come up with:

The officials’ warning comes ahead of a likely meeting between North Korean Supreme Leader Kim Jong Un and Putin, which the Kremlin announced earlier this week was “being prepared.”

We will announce the dates of the trip in due course," Kremlin spokesperson Dmitry Peskov said on Friday, French news agency AFP reported.

For its part, North Korea has sent munitions to Moscow, ostensibly to help Putin’s forces in their war against Ukraine, but also to take advantage of the opportunity to test its equipment on the battlefield, according to the Center for Strategic and International Studies think tank.

In return, North Korea “expects Russia to provide advanced weapons systems and technological know-how to significantly strengthen its defense, nuclear, and space programs,” the think tank said.

The six US officials also told NBC News that the Biden administration was concerned that the relationship could lead to significant developments in Pyongyang’s nuclear capabilities, increasing tensions in the Asia-Pacific region.

But earlier this month, the office of Ukraine’s top prosecutor, Andriy Kostin, told Reuters that North Korean-supplied weapons appeared to have a high failure rate.

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