Average, mean, median all have different meanings.

The average salary in Moscow is 124000 roubles a month

St Petersburg is 122000 a month.

But only 40000 a month in Murmansk

And 29000 a month in Dagestan.

Considering there is just over 20 million in combined Moscow and St Petersburg, and there is about 120 million people not in these places- the fact you can’t understand how averages work in statistics is a you problem.