#international responsibility

If Hungarian Prime Minister Viktor Orban admitted that drones entered Ukrainian airspace from Hungary, does this mean that Hungary can be held internationally responsible for violating Ukraine's sovereignty?

The President called for pressure on Russia over the seizure of a Ukrainian nuclear power plant. I am interested in whether Russia's actions during the war on the territory of Ukraine can be considered grounds for applying international legal responsibility. How can I count on the protection of my rights in this situation?

If another country begins negotiations to end the war in Ukraine but fails to fulfill its obligations, can it be held internationally responsible?