According to Rodger Baker, executive director of the Stratfor Center for Applied Geopolitics at Rane, a risk management firm, North Korea’s latest move is a signal that it could test a nuclear bomb in a month or two.

“The North Koreans have cleared their tunnels for their nuclear tests,” he said on CNBC’s “Squawk Box Asia,” adding that a test is expected to take place between China’s party congress in mid-October and the US midterm elections in November.

“It makes sense that if they’re going to do testing over the next month, a month and a half, the logic would be to do it between those two events,” he said.

“It’s probably for political considerations that North Koreans would be very cautious about testing in the middle of the Chinese Party Congress, it certainly might not go well for the Chinese leadership and their relationship with North Korea.”

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Read the full NBC article here.