South Korea and the United States will seek a UN Security Council presidential statement condemning Pyongyang's uranium enrichment program, a U.S. nonproliferation envoy said Wednesday.

Robert Einhorn, a special adviser for nonproliferation and arms control at the U.S. State Department, made the remarks after meeting with South Korea's chief nuclear negotiator Wi Sung-lac in Seoul.

"We're working hard to get a Security Council presidential statement that makes clear that North Korea's uranium enrichment program is a violation both of U.N. Security Council resolutions and a 2005 disarmament-for-aid deal," Einhorn told reporters.

Unlike a Security Council resolution, a presidential statement is not legally binding but does require accord amongst permanent members China, Russia, France, the United Kingdom, and the United States.

International concerns have grown sharply after a U.S. scientist said in November last year that he had been shown a new uranium enrichment plant in the Democratic People's Republic of Korea (DPRK).

Einhorn also said the U.S. government has no plan or intention to redeploy tactical nuclear weapons in South Korea, nor will the discussion regarding the issue affect revision of a civilian nuclear cooperation agreement between Seoul and Washington.

Einhorn, who arrived in Seoul on Tuesday for a four-day visit, is set to hold talks with South Korean officials on rewriting the nuclear cooperation accord between the two countries, which prohibits Seoul from reprocessing spent fuel from civilian nuclear power plants.