The wars against Ukraine and against Gaza are not just national and regional catastrophes. They are major threats to international security. They stem from and accelerate the disintegration of the post-Cold War world order. They reinforce a militaristic geopolitical turn in international relations. And they destroy all remaining hopes of a peace dividend, in which resources might be transferred from military and security spending to development. Both wars seem to mark a shift from industrial to hi-tech warfare. Yet in practice advanced technologies supplement rather than replace conventional warfighting in Ukraine and urban counterinsurgency in Gaza, increasing rather than diminishing the scale of the slaughter, and incurring enormous economic and social costs. Rearmament, military spending and arms transfers are on the rise, not just in Ukraine, Russia, and Israel. The risks of nuclear escalation have greatly increased. Furthermore, the conflicts, and the wider securitisation of which they are part, are having profound political consequences. National security is prioritised, boundaries are closing, human rights and freedoms are threatened almost everywhere. Russia and in Israel have both in their different ways become garrison states.