I must echo the other comments in this thread and point out the fact that this sort of generalisation does more harm than good by helping to cement one of the negative stereotypes concerning Eastern Europe (EE) (that somehow they lack the ability or the drive to work towards a more democratic society), which is also not backed by data. According to this 2019 BBC article [0] that looks at where in Europe's political landscape the right-wing nationalists hold sway, 8 out of top 10 countries are in Western Europe (WE). The UK is not on that list (nor other EE countries like Croatia for that matter), but I think it should be.

There's also a noticeable increase in right wing terrorism, which appears to take place more in WE than EE ("measured by overall volume of right-wing terrorism, Germany and Italy, the two former World War II Axis powers, lead the way"), where most targets show that the substantial majority of right-wing terrorist attacks have been aimed at immigrants and Muslims [1]. Possible explanations include the displacement of people from conflict zones like Syria and Afghanistan, but also the fact that most migrants in Europe are economic migrants, which means that they go from less economically developed countries to more developed ones, thus from EE to WE, which is why the rise of nationalism is higher in WE than EE. This, of course, is but speculation on my part, especially since countries like Hungary, Poland and Czechia have behaved rather poorly in this respect, on par with Austria, Italy and the UK.

Plenty to discuss here and there's a lot of information available, but I doubt we can simply point to EE and consider the matter closed, since this seems to be a global phenomenon.

[0] https://www.bbc.co.uk/news/world-europe-36130006 [1] https://www.opendemocracy.net/en/countering-radical-right/we...