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I was not saying they would do it just that if they did it, it would be problematic.
Relax everyone, Hungarian "status quo" is a piece of shit, but they also have the smallest border with Ukraine, so more activity for Poland/Slovakia/Romania... They'll appreciate.
Meanwhile when EU cuts funding for next 5 years, Orban will get the notice. >

If Poland blocked shipments that would be a lot more problematic. >

Yeah but why would we? Last I checked we are sitting at 1 million refugees and like 400 tanks sent to Ukraine. Feel free to deliver an aircraft carrier filled to brim with strategic bombers if you think it can pass through our borders and can help in beating Russia. Absolutely nobody would oppose the idea and you probably could even do it without anyone finding out until it's already in use (Polish forums specifically tell people NOT TO share any pics/videos of anything military related that goes to Ukraine).
Hungary is imho making a really poor decision here. Current polish government used to shield them from EU sanctions and vice versa. But elections are likely to change it to a more pro-western side and even current leadership does NOT want to be associated with Orban since it hurts their odds of winning. We risk effectively nothing adhering to EU law (frankly speaking most would want it numerically, it's just that our election system is sorta dumb and 40% votes can give you 50+% of seats), Hungarian autocracy on the other hand has a LOT to lose by betting on the wrong horse. And last I checked - Russia accounts for 2 billion $ exports for them. Germany alone is worth 37 billion and combined EU is like 100+... Heck, they had more exports to Ukraine than they had to Russia by like 50% in 2021.
If EU decides to actually take action against a non vital landlocked country with mere 10 million population and for instance embargoes them - this would be an instant collapse of a whole region as 70+% GDP would disappear into the void. It's not like Russia even has any deals that it can offer in response, it won't even give you preferential treatment on their gas/oil prices (since pipelines pass through other countries). 
It's just an all around clusterfuck of bad decisions. And probably the fact that Orban likes what he is seeing and really likes Russians - since if a politican can't look at something objectively and change their allegiances in a flash when it would be convenient then it just means they truly and absolutely believe in a given cause.