SEOUL, South Korea -- South Korean and U.S. troops began naval drills Monday in a show of force partly directed at North Korea amid signs that Pyongyang will soon follow through on a threat to conduct its third atomic test.
The region also has seen a boost in diplomatic activity since last month, when North Korea announced it would conduct a nuclear test to protest U.N. Security Council sanctions toughened after a satellite launch in December that the U.S. and others said was a disguised test of banned missile technology.
Pyongyang's two previous nuclear tests, in 2006 and 2009, both occurred after it was slapped with increased sanctions for similar rocket launches. As it issued its most recent punishment, the Security Council ordered North Korea to refrain from a nuclear test or face "significant action."
North Korea's state
media said Sunday that at a high-level Workers' Party meeting, leader Kim Jong Un issued "important" guidelines meant to bolster the army and protect national sovereignty. North Korea didn't elaborate, but Kim's guidelines likely refer to a nuclear test and suggest that Pyongyang
appears to have completed formal procedural steps and is preparing to conduct a nuclear test soon, according to South Korean analyst Hong Hyun-ik.
"We assess that North Korea has almost finished preparations for conducting a nuclear test anytime and all that's left is North Korea making a political decision" to do so, South Korean Defense Ministry spokesman Kim Min-seok told reporters Monday.
The spokesman said he couldn't disclose further details because they would involve confidential intelligence affairs. Recent satellite photos showed North Korea might have been sealing the tunnel into a mountainside where a nuclear device could be exploded.
On Monday, the South Korean and U.S. militaries kicked off three days of exercises off the Korean Peninsula's east coast that involve live-fire exercises, naval maneuvers and submarine detection drills.
South Korea's Joint Chiefs of Staff said the maneuvers are part of regular joint military training that the allies had scheduled before the latest nuclear tensions
began. But the training, which involves a nuclear-powered American submarine, could still send a warning against possible North Korean provocation, a South Korean military official said, requesting anonymity because of