And a lot of apologising and eating humble pie.
In about 1970 I was a 14 year old visiting Germany (I'm English) to improve my spoken German. I remember vividly being in Nuremberg railway station and a German teenager apparently jokingly gave a Nazi salute and said "Sieg Heil". I didn't see what had prompted this but the public roasting that she got from, presumably her family, was very dramatic. They had no way of knowing my nationality so it wasn't done in any way for my benefit.
My take on this incident is that 25 years after WW2 ended they were still super sensitive about distancing themselves from the years of Naziism and that phase of their history.
I don't have the feeling that Russia is even approaching that level of maturity and introspection and has the willingness to examine how they are perceived by other countries.