They like using proxies and non state actors who use proxies, there is no plausible deniability if the software or hardware shows remote tampering, it would take a nation states resources to do this and no non state actors have ever demonstrated competent and targeted attacks on critical or strategic infrastructure russia has baked in plausible deniability because of nigh on a decade of absolute lies and dishonesty from the US deepstate involving russia, her actions and interests. The public would mistrust claims of it having been russia at face value of our government being the boy who cried russia, if it were to be leaked that jews did it almost everyone would believe it or be convinced. Hell, I Could see russia doing it to blame israel and sow dissent between israel and the U.S. just because we all know ISIS is a joint operation of mossad and the U.S. intelligence apparatus and because israel has been poking the bear politically over the past few months. Putin's israel stance seems to predominantly one about retaining political order and power while inducing as much conflict between secular and orthodox jews as possible. The fact we can clearly see all western nations have fallen to kike subversion and russia seems not to have is evidence that he isn't quite in their pocket if russian intelligence hacked israeli GPS satellites and used them as back doors to hardware vulnerabilities in shipping vessels to strike the US and convinced just a few jews to say that it was well deserved punishment for tolerating anti israel protests you can bet israel would lose a great many friends in america. It's all speculative at this point we will likely only find out from leaks what may have happened but credible sourcing is seen as more improbable than ever so it is devalued and thus rumors portrayed as leaks might well cary near the same effect.