Hungary will not allow lethal weapons for Ukraine to transit its territory

Why not full Slovakia, part of Austria (Burgenland), Slovenia and whole Croatia? All them were lost for Hungary after WWI. :D Anyway, Hungary is not a revisionist country, there are revisionist politicians who has never ever been part of the government since 1990. However, the little core of truth in your statement is that there has been tense relations between the Hungrian ethnic minorities and the majorities in neighboring countries, and even though e.g. both Romania and Hungary are EU members, there is still discrimination based on ethnicity/language/religion. (The most extreme neighboring country is Ukraine, where minority languages are effectively banned in schools and public insitutes. That's one thing why Ukraine cannot easily join EU.) The Serbian relation is getting better (cultural autonomy is provided for Hungarian minority). I must also note that the vast majority of people in Hungary goes along well with Slovaks, Romanians etc., and the Hungarian people living as minority also are quite fine with people the live together with, so these issues are mostly happening in politics. For example Slovakia banned singing the Hungarian anthem in 2019 https://newsnow.tasr.sk/policy/simon-ban-on-singing-of-hunga... I wonder what would be a good policy for such an unfriendly act.

Nah, I meant more like avoiding them at dinner parties or diplomatic receptions.

if those weapons have been sold it is commerce, at any rate lots of things are called commerce that might stretch the definition so...