WASHINGTON

The Pentagon voiced concern Tuesday about the "deepening cooperation between Russia" and North Korea.

"The deepening cooperation between Russia and the DPRK (Democratic People’s Republic of Korea) is something that should be of concern, especially to anyone that's interested in maintaining peace and stability on the Korean Peninsula, but also supporting the people of Ukraine as they continue to fight against Russian aggression," spokesman Maj. Gen. Pat Ryder told reporters.

His remarks came after Russian President Vladimir Putin arrived in North Korea early Wednesday for his first visit in 24 years. Putin vowed to deepen ties with his nuclear-armed host.

"You're well aware of DPRK providing ammunition and weapons to Russia that's been able to help them perpetuate their illegal and unprovoked war against the Ukrainian people, so it's something that we're going to continue to keep an eye on," added Ryder.

He said the US’ focus in the Indo-Pacific region and the Korean Peninsula is to work with allies and partners to promote peace, stability and security in the region.

White House spokeswoman Karine Jean-Pierre separately echoed Ryder’s comments on the cooperation between Russia and North Korea.