will treat someone to, will offer someone
Может, угостишь?
Maybe you could treat me?
— Text (2019)
Угостишь?
Would you like to treat me?
— Боль и слава (2019)
Значит, ты угостишь нас кофе?
So, will you treat us to coffee?
— Сладкая жизнь (1960)
Может, кофе угостишь?
Would you like to buy me some coffee?