No. Ukraine has no obligation to Hungary. It's just choosing to no longer help Hungary with obtaining oil. Just as Hungary has no obligation to Ukraine to help them with their little russian problem.
Incredible. They’re essentially asking Ukraine to help them give money to the guys they’re fighting a war against and then getting mad and pouty when Ukraine says no.
This isn’t blackmail, it’s just common fucking sense while you’re at war. I feel for the people affected by this, but the leadership in Budapest and Bratislava can go pound sand.