What you’re citing there is a question to the Commission, not a research paper. The guy posing that question? A Greek Nazi, becoming MEP on a Golden Dawn ticket. Here’s the answer:

Yeah this was just pointed out to me. Which is why I went and dug out some other stuff instead, I’m not particularly fond of relying on that one and won’t be using it in future.

A couple of western media articles discussing the split the existing language law was causing in the country:

2000: Ukraine wages war on Russian language

2012: Russian language debate splits Ukraine

2012: Ukrainians(far right) protest against Russian language law

2014(when the law actually occurred): Ukraine Revokes Linguistic Rights

This last one is the most interesting, also 2014 from Time: Many Ukrainians Want Russia To Invade

Within two days of taking power, the revolutionary leaders passed a bill revoking the rights of Ukraine’s regions to make Russian an official language alongside Ukrainian. That outraged the Russian-speaking half of the country, and the ban was quickly lifted. But the damage was done. With that one ill-considered piece of legislation, the new leaders had convinced millions of ethnic Russians that a wave of repression awaited them. So it was no surprise on Friday when a livid mob in Crimea attacked a liberal lawmaker who came to reason with them. Struggling to make his case over the screaming throng, Petro Poroshenko was chased back to his car amid cries of “fascist!”

Is this article a hallucination too? This aggressive response is quite unnecessary. Have a more academic conversation.