The United States and other nations have expressed serious concern over North Korea's announcement that it has nuclear weapons and will withdraw from disarmament talks indefinitely. US Secretary of State Condoleezza Rice said Pyongyang will only deepen its isolation from the rest of the world if it continues nuclear arms development. Other participants in the stalled six-nation talks -- China, Japan, South Korea, and Russia -- all expressed hope North Korea will return to the negotiations. European Union foreign affairs chief Javier Solana called for Pyongyang to rethink its position, while British Foreign Secretary Jack Straw took a harder line, saying North Korea would be making a serious mistake to continue along its current path. Pyongyang said early Thursday that it plans to keep its atomic weapons as a deterrent. North Korean officials had hinted about Pyongyang's weapons, but this was the first public confirmation. The White House says it remains committed to a diplomatic resolution of the nuclear issue.