South Korea accused North Korea of having mobilized a dozen submarines and doubled its artillery along the border while the parties are in talks to resolve the crisis.
A spokesman for the country's defense ministry says that 70 percent of the North Korean submarine fleet - which is at around 50 boats - have left their bases and are no longer visible on South Korea's radar.
In addition, North Korea has doubled its artillery along the border, according to the spokesman.
The spokesperson also claims that North Korea is playing with multiple cards by gearing up while the crisis is still being negotiated.
On Sunday envoys from North Korea and South Korea met for a second round of talks after hours of fruitless talks on Saturday.
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