What's interesting is that we don't even know if this is a screw-up or intentional (and it could be both since multiple parties are involved). It really doesn't seem like an acoustic effect (as raised in the article) and may well be a modulated microwave since that would correspond both to the locality of the "noise" and brain effects. Or it could simply be very high powered.

http://www.newsweek.com/russia-us-attack-cuba-officials-6495...

http://www.cnn.com/2017/10/13/politics/cuba-us-diplomats-aco...

I fully expect a barrage, but based on your question, cui bono... Russia needs to keep the US separate from Cuba. They want the client state that provides a physical base and influence in the US backyard. Why now is another question, but perhaps because they thought they could get away with it now.