Washington's action, announced Thursday, blocks any assets of three North Korean officials in the United States, a largely symbolic step against an isolated country that has defied international pressure over its weapons programs.

The US Treasury Department also threatened sanctions against anyone who conducts transactions with Jon Il Ho, Yu Jin and Kim Su Gil, who were identified as directly involved in weapons development.

The recent North Korean missile launches, including the test of an intercontinental ballistic missile with the range to hit the US mainland, "pose grave security risks to the region and entire world," Secretary of State Antony Blinken said in a statement.

The sanctions "underscore our sustained resolve to promote accountability in response to Pyongyang's pace, scale and scope of ballistic missile launches."

Blinken added that the action was taken in coordination with US allies South Korea and Japan, and noted that the European Union issued similar designations of the three in April.

Tokyo and Seoul on Friday also announced new sanctions.

South Korea said it would target eight individuals, including a Taiwanese and a Singaporean national.

They have "contributed to North Korea's nuclear and missile development and evasion of (pre-existing) sanctions", the South Korean foreign ministry said in a statement.

All are already subject to US sanctions, the ministry added, and South Korea's new restrictions are expected to "alert the domestic and international community of the risks of transactions with these entities".

And Japan said that in response to Pyongyang's "provocative acts", it was freezing the assets of three North Korean groups -- Korea Haegumgang Trading Corp, Korea Namgang Trading Corp and Lazarus Group -- and one person, Kim Su Il.

The United States has voiced frustration that China, North Korea's closest ally, and Russia have blocked efforts at the UN Security Council to impose tougher sanctions.