Russia dwarfs Sudan: about 16,879,701 km² km² against 1,863,027 km² km². At true size Russia is about 9.1× larger — the whole of Sudan fits into Russia roughly 9 times.
Russia sits in Europe, Sudan in Africa. On the old Mercator map the latitude gap distorted how large each felt beside the other; at true size the answer is simply 9.1×.
The old map muddied it further: Mercator inflates Russia about 6.1× and Sudan about 1.1×, so on a Mercator-style map this pair appears 50.8× apart instead of the true 9.1×.
Sudan fits 9× into Russia.