Requires a rigorous definition of interference.
The allegations here—trying to catch politicians on tape being sleazy and then releasing them with sketchy editing-doesn’t seem to rise to the level of calling for a kinetic response.
Controlling Hungary is enough to veto some support for Ukraine.
A deal with foreign intelligence is a dead with the devil that comes with a lifetime of subservience. And subservience to foreign powers is a greater evil than yo usual internal corruption. At least the locally corrupt in a democracy have some interest in things going somewhat well in their country. The foreign actors only care about theirs.
What I do think is that nations should 1) interfere back, and 2) make their citizens more resilient to foreign propaganda. And I specifically don't mean building a firewall. In fact do the opposite: if a firewalled nation is leaking out propaganda, ensure firewall-breaking tools leak in.