As of 2020, which of these cities is the most populous city in Europe?

since when is Moscow in Europe ?

dragon, that's what I thought. But it turns out that Moscow is 1000 miles WEST of the Ural Mountains. So half of Russia is in Europe.

Moscow is not in Europe, its in Russia which is not Europe?

Arguably Istanbul should be the answer as it has 15.8 million. The city is on both sides of the Bosphorus Strait so is both in Europe and Asia, but that could be the argument against too.