Moscow is about 2.7 times bigger than Sao Tome and Principe.

Sao Tome and Principe is approximately 964 sq km, while Moscow is approximately 2,562 sq km, making Moscow 166% larger than Sao Tome and Principe.
Tip: This to-scale comparison of Sao Tome and Principe vs. Moscow uses the Mercator projection, which distorts the size of regions near the poles.