Khabib being a huge star In russia makes a fight In russia a massive fight. Doesn't matter who the A side Is, It's about where the fight will make the most money.
They wont do a PPV in Russia because of the timezones. It would be held at like 6am local time just to be primetime in the US. So i only expect Fight Night events. Not that a card in Ireland is likely either, its more likely they'd hold it in London if they wanna do a PPV show in Europe.