The United States has detected activity at potential test sites in North Korea indicating possible preparations for a nuclear test, a U.S. defense official said on Wednesday, as China urged restraint after the reclusive state said it planned a nuclear test, according to Reuters. U.S. spy satellites have picked up unusual movement of vehicles and other activity at locations that might occur before an underground nuclear test, the U.S. official said, speaking on condition of anonymity because of the sensitivity of the matter. But the official said the evidence was not definitive and noted that because the North Koreans have never conducted a nuclear test, "we don't really know what we're looking for." Meanwhile China, the closest North Korea has to an ally, called for restraint amid rising tensions after Tuesday's announcement by Pyongyang. "We hope that North Korea will exercise necessary calm and restraint over the nuclear test issue," Foreign Ministry spokesman Liu Jianchao said in a short statement on Wednesday on the ministry's Web site (www.fmprc.gov.cn). Liu urged a negotiated settlement, saying countries should "not take actions that escalate tensions." Russia's and South Korea's foreign ministers denounced as "unacceptable" Pyongyang's plan for a test, the Russian Foreign Ministry said in a statement. It said Russia's Sergei Lavrov and South Korea's Ban Ki-moon discussed the North Korean situation by telephone. "It was stressed that such steps, which could only aggravate the situation ... are unacceptable," the statement said. The United States, France and Japan have all pressed for the issue to be dealt with at the United Nations. But Beijing wants it resolved through six-country talks set up to end North Korea's nuclear weapons program. North Korea has snubbed those talks -- involving the two Koreas, China, Japan, Russia and the United States -- for almost a year. Pyongyang has refused to return until the United States ends a crackdown on North Korean offshore bank accounts, which Washington says is aimed at ending suspected illicit activities and has nothing to do with the six-party process. Analysts and officials said Pyongyang's nuclear test announcement on Tuesday could well be an attempt to push the United States into direct talks about ending the crackdown. South Korea's Unification Minister, Lee Jong-seok, said he saw a strong element of trying to apply pressure on the United States. "In the event efforts to resume the six-party talks break down, the possibility of a North Korean nuclear test is high," Lee told a parliamentary committee. Analysts say North Korea probably could make a nuclear weapon but lacks the technology to make it small enough to fit on a missile. They also note that in its July test, North Korea's long-range missile fizzled out just after take-off. The Stalinist state has triggered diplomatic crises in the past to get its voice heard. Tension on the divided Korean peninsula has risen sharply since July when Pyongyang defied international warnings by test-firing missiles. North Korea argues that its hand has been forced by what a North Korean diplomat called Washington's "proclamation of war" by threatening economic sanctions. "These kinds of threats of nuclear war and tensions and pressure by the United States compel us to conduct a nuclear test," North Korean embassy spokesman Pak Myong Guk told Reuters in Canberra. "Now the situation around the Korean peninsula is very tense," Pak said. "It may be breaking out (in) a war at any time, I think." Diplomats who have visited North Korea in recent months say officials they have spoken to seem to genuinely believe that the United States -- which keeps 30,000 troops stationed in the South and has branded the North as part of an "axis of evil" -- is set to bring down their government. They doubt the risk of sanctions and more damage to an already subsistence economy will deter the Pyongyang government, which rights groups say has one of the world's worst human rights records. The North's latest move is certain to dominate talks from this weekend when Japan's new prime minister, Shinzo Abe, visits South Korea and China. Some analysts said North Korea may have timed its announcement partly in the hope that China and South Korea will persuade Japan to soften its approach to North Korea.
