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You think Ukrainians shouldn't decide which language to use? Also russian is native for millions of Ukrainians due to ethnic cleansing done by russians for centuries.
Any government who denies this to their national minorities should be promptly replaced as this kind of disrespect to other peoples' culture, religion and national identity inevitably leads to bad outcomes.
This has been confirmed by various Russian declarations and maps.
The diplomatic issues are merely an official stance that is presented to convince the gullible. It's on you if you believe it.
You can look at Moldova, Georgia, Romania and Chechnya for other examples of Putin and Russia's imperialistic ambissions.