Here in Venezuela, the weapon of choice by the peoples of the Amazon is the blowgun, usually using darts with poison on them.
As for Hugo Chavez' weapons of choice, here come in Russian rifles, Russian helicopters, Russian planes and Russian submarines. (Some of which he bought the other day!)
In Ecuador, same thing for the Amazon part of it. As of the Incan-occupied territories, the spears and slings were weapons of choice to fight them Conquistadores! They still lost anyway...
As for Russia, well, here's a long weapon history... There's othe swords and spears used by the Cossacks and other people from the Feudal times. During the age of colonization and discovery, Russia had a wide variety of muskets on them. While during WWII, the then Soviet Union had a collection of rifles and pistols such as the Mosin Nagant and the Tokarev series. And later on, we have nuclear weaponery, modern rifles and nuclear submarines as weapons of choice.
Personally, my favorite weapon of the mentioned is the Mosin Nagant. Have I been playing "Call of Duty" way too much?