"Russia would need significantly more ground forces to conquer Ukraine — far more than the current 3.4 Russian soldiers per 1,000 Ukrainian citizens. The force ratios in successful operations are astronomically higher, such as 89.3 troops per 1,000 inhabitants in Germany (1945), 17.5 in Bosnia (1995), 9.8 in East Timor (2000), and 19.3 in Kosovo (2000). High numbers of troops and police are critical to establish basic law & order. In fact, the number of Russian soldiers in Ukraine aren’t even enough to hold any major cities for long. They will be in serious danger of being picked apart by Ukrainian insurgents.

https://www.washingtontimes.com/news/2022/feb/28/russian-for...