The basic facts about European history is that Russia, Prussia, France, England, Rome, Ottoman were generally jostling borders and usually the others didn't like it when one of them was growing too much. Borders have been shifting in Europe for millennia, and we are slowly readjusting post-Cold War era.
And nothing changed from that time. British still don't like the size of Russia so they started proxy war because of that.
I, on the other hand, perfectly fine with the the size of Russia but now think that Ukraine should be back in Russia.
And don't forget that Poland, Baltic states and Finland were part of Russian Empire.
Just saying.