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This is a map of the NATO countries. NATO is a defensive organization which pledges that an attack on one is an attack on all.
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This philosophy is why there are non- US combatants in Afghanistan (it was covered by NATO due to the attack on the World Trade Center). There were other troops (like Aussie's) in Iraq because it was a coalition of the "willing" (or "duped"), but it is not a NATO exercise.
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Turkey is a key member of NATO and has hosted US Troops and nuclear weapons throughout our relationship. It was Turkish ships that were attacked in International Waters - illegally - by Israel.
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Turkey has stated that Turkish warships may convoy in the next ships to Gaza.
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What do we do if Israel attacks Turkish warships in International Waters?
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Okay, it is a trick question because of course our lackey Congress and Administration will pucker up and kiss their ass, as we continue to ship our ally Israel billions and billions of dollars (which those damn socialists use to subsidize universal health care!) in order not to piss off American voting blocks.
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And so our supplicant relationship to Israel will destroy a long standing alliance of anti-communists and expansionists that has served us well and helped bring down a horrible Soviet regime. But Israel will get to continue their Gaza Blockade :-). Yay!