Implausible and biased.
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Why say that? A simple google of "cyprus chechnya terrorist training turkey" leads to articles dating back to 2000 from sources as varied as The WP, Pravda, VOA and DoJ that make the same allegations.
Russia and turkey are long-time enemies and turkey has been training military from former USSR states since the dissolution, as well as pushing to extend its oen sphere of influence into the oil fields of the Caucucus.