Jordan will only defend due too their Constitution. If rumors are true that they are approaching the boarder...then that is a shore up for defense. North Thunder is not considered a planned attack.....but a defensive exercise. If a ground offensive is deemed to be a go....it will enter through Jordan. Here's the "scary"

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Saudi media said some 350,000 forces from the Persian Gulf Arab states and a number of other countries will take part in the Saudi-led military maneuver in the area of Hafer al-Batin in northern Saudi Arabia.

Some 2,540 warplanes, 20,000 tanks and 460 helicopters will also participate in the exercise, dubbed “North Thunder.”

In 18 days of maneuvers, the airspace over northern Saudi Arabia will be closed.

Media reports say the maneuver will be the largest throughout the history of the region .

Egypt, Sudan, Pakistan and Persian Gulf Arab states are among the 25 countries that will take part in the military exercises.

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ref: http://en.alalam.ir/News/1787755#sthash.JNASSJIg.dpuf

............ let's just say......who knows....but the latest rhetoric coming from some of these nations...well..:

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Turkey may join Saudis in ground war against ISIS in Syria ...
www.nydailynews.com/.../turkey-join-saudis-ground-war-isis-sy...Daily News
12 hours ago - Turkey's foreign minister says his country and Saudi Arabia may launch ground operations against ISIS in Syria, Turkish media reported ...

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Quote:

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Bahrain says ready to commit ground forces to Syria | Reuters
www.reuters.com/.../us-mideast-crisis-syria-bahrain-idUSKCN0V...
Reuters
Feb 6, 2016 - Bahrain is ready to commit ground troops to Syria as part of a U.-S.-led ...

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..on and on.....it's the smell of war currently.....a major one....but it is only a smell as of today...