A million roubles in the time of Catherine II equals roughly a billion modern roubles
Some Interesting Calculations Showing That in 34 Years Catherine II Spent More Than 88 Million Roubles on Her Favourites.
Of course, it is impossible to say exactly how much this would be in present-day roubles, but judging by purchasing power, the cost of a basket of provisions and, say, the price of gold, a Catherinian million is equivalent to a sum of the order of a billion modern roubles