No ethnic tensions really happened in Ukraine ever. Biggest problem I (as ethnic Russian and Ukrainian citizen) ever had was about spelling my name in Latin letters.
It's totally made up topic that just appears before elections.
You can use spoken and written Russian almost everywhere including contracts, court, communication with government employees, etc.
They may happen now in Russia-occupied and war-torn areas and boarding areas, but don't happen on the South that is controlled by government and where Russian-speaking and people of Russian ethnos also live.
Yet, at Donbass and Crimea Ukrainians and Crimean tatars are threatened.
So yes, there are ethnic tensions now, thanks to Russian govt.
No ethnic tensions really happened in Ukraine ever. Biggest problem I (as ethnic Russian and Ukrainian citizen) ever had was about spelling my name in Latin letters.
It's totally made up topic that just appears before elections.
You can use spoken and written Russian almost everywhere including contracts, court, communication with government employees, etc.