Comment by enzino

They don't need to engage in traditional warfare. It's enough to bring their products near their enemy and ask for payment in exchange for them. You know, what merchants do. The enemy is stubborn and insists in "paying" them with fake monopoly money, they are stubborn and don't discharge their merchandise. The people in the enemy country as so accustomed to high-quality cheap products that they want them more than a corrupt government, and would gladly rise against it if, say, their traditional Christmas presents are at risk.