If the country with likely the most security experts (and the people who wrote the vulnerable software...) is vulnerable, what do you think Russia is?

If Russia can coordinate and fund a massive, coordinated attack, what do you think the US can do?

I'll throw this in: a big part of computer attacks is going unnoticed. I realize not noticing something could mean nothing's been done, but when you consider something like the success of Stuxnet on that front for 5 years while decimating malicious industrial equipment, it's not completely hollow to lean towards success versus failure in that uncertainty.