The fact that such alleged attacks are reported both in Cuba and in China, which nations have very little history of technical collaboration, makes it more likely that the alleged weapon was actually used by elements of USA bureaucracy. USA diplomats are the common thread here, no matter what purpose is assumed. It will certainly not be the first case of those serving the military-industrial complex being directly victimized by same.

If Russia had just wanted to play with their new toy while victimizing people with no local sympathy, they could have hit e.g. guest workers in Dubai and Western expats in Thailand. Actually they have lots of isolated communities in Siberia they could have observed more easily while staying out of the news completely.

Even if the "what", "where", and "when" ends up conforming to current "journalistic" speculation in these cases, the "how", "why", and "who" will probably never be really known. It's fine to be suspicious when Russian media are blaming USA, because they are "rivals". In the reversed case, why wouldn't one retain that suspicion?