How could depleting a country's natural resources affect international peace and security?

For example if you have less amount of oil in your country or say less amount of coal....Where will you get it from? From other countries or it will be smuggled by people (smuggling is common in most countries)so that they earn extra income from the smuggled oil.This in turn affects the international peace and security by hampering the internal peace of that country. All this conflicts cause problems and result in wars