Hasn't the Russian government been reliant on open source software for something like a decade or more at this point? In their case, I think it was more related to saving money rather than dependence or security concerns, however.

Degenerates like Aubrey 'Kirtaner' Cottle, of Anonymous fame, were still hacking into Russian systems, regardless. (Thankfully, this complete and utter scumbag is now in jail after a chain of stupid actions, including defacing the Texas Republican Party's website and breaching bail conditions.)