Wars have never been the concern only of their combatants. Other states pay close attention to the geo-political implications and opportunities created by armed conflict, and interfere directly or indirectly when their cynical calculations suggest that would advance their interests. For example, various countries - the UAE, Iran, Egypt, Turkey, Saudi Arabia, Russia and Qatar - have been involving themselves in Sudan's ghastly civil war, apparently looking to pick up geopolitical advantages - especially access to Red Sea ports that would allow them to threaten international shipping via the Suez Canal, or to prevent other states from doing so. When extended to material support to favoured factions this increases the resources of the combatants, increasing the ambition of their respective war goals and so extending the war by reducing the scope for a mutually acceptable peace deal.
Such amoral realpolitik in international relations is as old as war itself, together with its unfortunate consequences for human lives. What is somewhat more recent is the rise of international moral concern for the lives of civilians threatened by war, expressed through the increased influence of civil society. At least since the Greeks' 1820's war of independence, states have also been interfering in other people's wars out of humanitarian concerns to reduce civilian suffering.
The problem is that although each individual humanitarian intervention may be sincerely morally motivated - and even sometimes succeed in its goal of reducing suffering - the practise of morally motivated interference would seem actually to increase the amount of civilian suffering due to war. It makes civil wars more likely to start and harder to end, while incentivising crimes against civilians.



