Program Note: Tune in tonight to hear more on the North Korea nuclear threat on AC360° at 10 p.m. ET.

Commercial satellite imagery of Yongbyon Nuclear site from the Institute for Science and International Security.

Barbara Starr
CNN Pentagon Correspondent

Here's some insight to consider, as North Korea launches short range rockets and threatens military action, while thousands of US troops are stationed in the region:

- Four US military sources tell me there is no evidence North Korea has restarted its nuclear plant. An analysis of commercial satellite imagery by the Institute for Science and International Security makes a similar observation. Based on their reading of satellite images taken May 26th there does not appear to be any emissions from the plant.  That’s not to say the situation won’t change.

- There is no unusual military movement on the North Korean side of the border, US military sources say, noting that NK is ‘getting a lot of mileage” out of this rhetoric and saber rattling, as always. But there's no evidence at this point that North Korea is taking any conventional military steps.

- I am told the US has no current plans to move any units around inside the Pacific theater or send fresh units there. US troops in Korea are always at the ready but there is no move to step up the stance.

- There is concern about the nuclear test. The US is analyzing air samples and we might get some results by the end of the week

The bottom line: there is tons of rhetoric, little action. The big focus remains the nuke test.