That efficiency of production lead to pistols becoming quite popular in the United States after the fall of the Soviet Union. Once the Soviet Union collapsed a surplus of Russian firearms were released in the United States where civilian shooters could gobble up the pistols for $200-$300 at most gun shops. These handguns were very cheap on the . market and the price point is what made them so popular. The 9mm Makarov round was also quite cheap and easy to find due to the amounts of surplus being imported from the former Soviet Union.
Poland, Hungary , and Czechoslovakia have developed their own handgun designs chambering the 9×18mm round. Hungary developed the FEG PA-63 , Poland the P-64 and the P-83 Wanad and Czechoslovakia the . While similar in operation (straight blowback), and chambered for the same round, these 9 mm Makarov firing pistols are often found labeled at gun shows by some US gun retailers as "Polish Makarovs" and "Hungarian Makarovs". Nonetheless, these cosmetically similar designs are independent of the PM and have more in common with the Walther PP (which, in fact, was also a major influence on the original Russian Makarov  ).
The Maks advantage was always size. It could be carried in uniform or out. As I understand it even in the old USSR military officers were armed at all times. Like the US of A was before Korea and the Democrat Party insisting guns cause violence not stop it. Most Police reinforcements carry long arms I see no real need UNLESS some Russian agencies have an equipment shortage. The big drum magazine is also an attention grabber. Geoff Who notes the Nazi Luftwaffe preference for the PP and PP/K and even smaller sidearms, especially during the civil war in Spain where you might be attacked anywhere.