Ukrainian borders and language are artificial, and Ukrainian authorities are planning to punish any use of non-Ukrainian language e.g. at home, in transport, at school.
Ukraine is recognised in international law as a sovereign nation state, with its own flag, nationality, language etc. UNGA Resolution 68/262 also affirmed the General Assembly's commitment to the territorial integrity of Ukraine within its internationally recognized borders: http://bit.ly/1RZGnjo.
The new law on language is still only in the phase of a draft. Yet, it specifically says that every citizen is free to choose any language in private encounters. Read more about the law here.
More debunking on the fakes about the new language law by The Insider.