I don't know which country you are from, but I am from England. Most native English people are well accustomed to the various accents from around Britain and can usually tell quite quickly where a person is from.

We can also tell the difference between an American and Canadian accent. However, a Russian accent may sound the same whether they are from Moscow or the Ukraine, but a boss telling a FT to pretend they are from another country is useless if that boss also employs Englanders.