These are all the full-scale wars except the one in Sri Lanka. Iran purchases weapons from North Korea, which has antagonistic relations with every democracy in the world. The civil war in Afghanistan illustrates a common pattern whereby dictatorships support armed factions against each other, as in the case of fundamentalist Islam versus Arab nationalists such as the Ba'athists. This is true of Iran versus Pakistan and Saudi Arabia. On the other hand, along with Russia and Iran, it has also tried to secure a democratic peace in Afghanistan through compromise, though these efforts have been undermined by Saudi Arabia, which still supports the Taleban.
Western democracies hold a monopoly on the means of force.
On the contrary. There has been a proliferation of weaponry around the world while Western democracies have generally been cutting back. China is a major nuclear power with ICBMs and a veto in the United Nations. It is Western democracies that are keeping other countries from becoming democratic. The West kept Milosevic in power until he stopped bowing down to Western dictators.