It doesn't matter how often you repeat the US was involved you...

It doesn't matter how often you repeat the US was involved you have absolutely nothing to support that claim.... but thanks for confirming as much. Maybe you've been reading too much RT ?
It seems a bit odd and/or revealing that such a advanced and important facility apparently wasn't effectively protected against what's claimed to be attack by relatively slow moving and noisy drones ?
Evidence of another chink in Putin's armour ? Or maybe even a inside job ?