For those who haven't noticed, the US/Israel/Iran war and the Ukraine/Russia war just merged. Countries currently shooting at each other: Ukraine, Russia, Iran, Israel, US, UAE, Saudi Arabia, Lebanon, Iraq, Yemen, Jordan, Egypt, Bahrain, Kuwait... See the lead story in the New York Times for the past two days.
This war has crossed an important threshold. No pair of countries, one on each side, can stop the war now. The US and Iran can no longer stop it alone. Ukraine and Russia can no longer stop it alone. This is very like WWI - too many combatants with differing motivations. This much isn't a projection. This is the current reality.
It looks like a long war. Expect a very large, expensive military buildup. That's going to need war plants, built in a hurry. Ammunition. Weapons. Drones by the millions.