News report indicate that, the US and South Korea are conducting annual military drills which consistently infuriate Pyongyang, despite appeals to halt the exercise.
According to BBC, last week North Korea said it would watch US actions, after it suspend its missile test towards US Pacific area.
In a reaction, North Korea has already condemned these drills as pouring "gasoline on fire".
But, Washington describes the drills as defensive in nature, but the North sees them as preparation for invasion.
China and Russia had in July proposed a halt on military exercises in exchange for a freeze on missile tests.
BBC said, Joseph Dunford, chairman of the US Joint Chiefs of Staff, said last week that the military exercises were "not currently on the table as part of the negotiation at any level" and the Ulchi-Freedom Guardian (UFG) exercises were going ahead as planned.
About 17,500 US troops and 50,000 South Korean troops are involved in the exercises, which will last for about 10 days.
After North Korea's threats on Guam and an almost unprecedented war of words over Pyongyang's repeated missile tests, analysts have warned that the joint drills may be seen as a provocation at a particularly sensitive time.