The United States on Wednesday imposed sanctions on six North Koreans, one Russian and a Russian company linked to North Korea's weapons program in an attempt to stifle its further development, just a day after the secretive nation launched another missile.

The U.S. Treasury Department said the steps aimed to prevent the advancement of North Korea's weapons programs and impede its attempts to proliferate weapons technologies.

It said they followed six North Korean ballistic missile launches since September 2021, each of which it said violated multiple U.N. Security Council resolutions.

U.S. Undersecretary of the Treasury for Terrorism and Financial Intelligence Brian Nelson said the moves targeted North Korea's "continued use of overseas representatives to illegally procure goods for weapons."

North Korea's latest missile launches were "further evidence that it continues to advance prohibited programs despite the international community’s calls for diplomacy and denuclearization," Nelson said in a statement.

The statement said the U.S. State Department had designated Russia-based North Korean Choe Myong Hyon, Russian national Roman Anatolyevich Alara and the Russian firm Parsek LLC for "activities or transactions that have materially contributed to the proliferation of weapons of mass destruction or their means of delivery."

It said Choe Myong Hyon, a Vladivostok-based representative of North Korea’s Second Academy of Natural Sciences (SANS), had worked to procure telecommunications-related equipment from Russia.

Four China-based North Korean representatives of SANS-subordinate organizations – Sim Kwang Sok, Kim Song Hun, Kang Chol Hak and Pyon Kwang Chol – and one other North Korean, O Yong Ho, were also targeted.

The Treasury said Sim Kwang Sok, based in Dalian, had worked to procure steel alloys and Kim Song Hun, who was based in Shenyang, software and chemicals.

North Korean leader Kim Jong Un called to boost his country's strategic military forces while observing the test of a hypersonic missile on Tuesday, North Korean state media said.

The second test in less than a week underscored Kim's new year's vow to bolster the military with cutting-edge technology at a time when talks with South Korea and the United States have stalled.

Tuesday's test occurred hours after the U.S. mission to the United Nations, joined by Albania, France, Ireland, Japan and the United Kingdom, condemned last week's launch and called on U.N. member states to fulfill their sanctions obligations.

U.N. Security Council resolutions ban all North Korean ballistic missile and nuclear tests and have imposed sanctions over the programs.

Wednesday's actions freeze any U.S.-related assets of those targeted and prohibit all dealings with them.