Here’s an article of  a Ukrainian who has lived for 5 years in Belarus.

What’s the difference between Ukrainian and his brother Belarusian? There’s a striking difference. https://shkolazhizni.ru/world/articles/43305/

Author  describes behaviour of ordinary Ukrainians similar to those of Russians. He says Belarusians have cold mentality, almost Nordic like saying Belarus is the place where Slavs are becoming Balts.

In my opinion, Ukrainians and Russians are similar people . Belarusians are more different to the Russians than Ukrainians to Russians. For some reason we are friendlier to the Russians than Ukrainians.

Belarusians  are friendly to all their neighbours – Poles, Lithuanians, Ukrainians, Latvians, Russians.