The United States is concerned by Russia's growing relationship with North Korea and by what technology the two countries may be exchanging, the top U.S. arms control official said on Wednesday.

North Korea ratified a major defense treaty with Russia stipulating mutual military aid, the North’s state media reported Tuesday, as the U.S., South Korea and Ukraine say North Korea has sent thousands of troops to Russia to support its war against Ukraine.

Photos have started appearing on Russian social media showing the transport of North Korean long-range artillery systems that have been delivered to Russia. According to Defense Blog, these include the M1989 "Koksan,

Photos have begun to appear on Russian social media showing the transport of North Korean long-range artillery systems that have been delivered to Russia. According to Defence Blog, these include the M1989 "Koksan",