Additional S-400 air defense components have arrived in Turkey, as Washington remains unusually silent while reportedly contemplating the proper timing and degree of pain it wants to inflict on its NATO ally for disobedience.

An Ilyushin Il-76 cargo plane landed at Murted Turkish Air Force Base just outside Ankara on Saturday with the latest batch of S-400 parts, the Defense Ministry confirmed, a day after three gigantic Antonov An-124 jets delivered the first components of the defense system. The cargo was welcomed by a large number of military personnel and offloaded by heavy-duty military trucks into secure hangars.

Despite the lack of immediate reaction from Washington, the White House is currently working on a sanctions package which will be invoked under the Countering America’s Adversaries through Sanctions Act (CAATSA), sources familiar with the matter told Bloomberg. The content and degree of the punitive measures have reportedly already been carefully debated between State Department and National Security Council officials together with the Pentagon.

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Now it is up to Trump to sign off on the package, which is unlikely to come before the end of next week, as the administration allegedly wants to “wait until after Monday's anniversary” of the Turkey military coup attempt as to “avoid fueling further speculation” about Washington’s possible involvement.

Turkish President Recep Tayyip Erdogan blamed the failed July 15, 2016 rebellion on a cleric living in the US under CIA protection and – amid souring relations with Washington which accused Turkey of conducting a brutal crackdown on the coup plotters – began increasingly turning to Russia for defense supplies.

Also on rt.com Pentagon silent on Turkey’s S-400 delivery as Congress demands immediate sanctions

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