Mexico dwarfs Russia: about 1,962,279 km² km² against 16,879,701 km² km². At true size Mexico is about 8.6× larger — the whole of Russia fits into Mexico roughly 8 times.
Mexico sits in North America, Russia in Europe. On the old Mercator map the latitude gap distorted how large each felt beside the other; at true size the answer is simply 8.6×.
The old map muddied it further: Mercator inflates Mexico about 1.2× and Russia about 6.1×, so on a Mercator-style map this pair appears 43.4× apart instead of the true 8.6×.
Mexico fits 8× into Russia.