There, to illustrate. More than 95% of Moscow's GDP is contained within the red circle. The rest is peanuts.
Here, I've assumed the rest outside of the red circle produces exactly 5% of the yellow area's GDP, i.e. $20.3 bn in 2010, which is very generous for those forests, bogland, and derelict towns. The City of Moscow proper had a GDP of $332.8 bn in 2010, and another $52.5 bn was produced in the suburbs within the red circle if we assume $20.3 bn outside the red circle.
