U.S. Deputy Secretary of State Kurt Campbell says that Washington and its allies are “alarmed” by North Korea’s nuclear and missile threats as well as its increasing military support for Russia’s war in Ukraine,

Ukraine says North Korean military engineers have been sent to Russia to check how well missiles are launching.

Pyongyang was supplying military personnel to Russia’s army and workers for its factories, President Volodymyr Zelensky said.

The U.S. and its allies are “alarmed” by North Korea’s nuclear and missile threats as well as its increasing military support for Russia’s war in Ukraine, a senior U.S. official said Wednesday, but couldn’t confirm Ukrainian claims that North Korean soldiers were sent to fight for Moscow.

Vladimir Putin’s spokesperson had a rather cagey response to questions about Russia’s deal with North Korea on Tuesday amid rising fears the two countries could team up against Ukraine. Moscow and Pyongyang signed a treaty in June which reportedly included a mutual assistance clause,

Moscow said Tuesday that a defense pact it signed with North Korea earlier this year is "unambiguous," as tensions flared over Pyongyang's destruction of roads leading to South Korea. North Korea blew up sections of roads and rail lines on its side of the heavily fortified border between the two Koreas on Tuesday,