I can confirm that ‘error’ and ‘mistake’ is the same word in Polish. I don’t think it matters here, though. And I am sure that Mr Sikorski knows the difference. His speech, although often harsh, is very diplomatic. When he says ‘Trump made a mistake’ it can safely be read as ‘Trump is a complete idiot’.

I am not sure about that ‘in practice’ in Russia. People falling from windows or dying in labor camps are not just accidents.