LOL, in the article about Nikolai..

"A source who spoke to The Post on the condition of anonymity described Mushegian as a loner who lived with his dog, Sunny, following a breakup with the girlfriend he called a “spy” in his last tweet. But another source said there was “no way” she was a spy."

Ok, then.

The sad truth is that it while it could be an exciting foreign-espionage plot line that made it into the public eye, the more likely story is he was suffering from paranoid delusions following a hard breakup and committed suicide. The latter is a sadly common occurrence, way more than the annual number of spook hits.