Tuesday briefing: With the horror of conflict throughout the globe, how likely is world war three?

In today’s newsletter: Our diplomatic editor on how global instability feeds into conflict in so many parts of the world, and whether the threshold for a major global war has been metGood morning. The world is at war. From the trenches of eastern Ukraine to the missile-streaked skies of the Gulf, a growing proportion of humanity is living under the horror of conflict. For some observers, there are gnawing fears that the worst is yet to come. The apparent collapse of the rules-based international order, the irrelevance of institutions designed to uphold it, and the interconnectedness of the fighting have sparked warnings that we could be at the beginning of a third world war. Indeed, half of Britons polled in a recent YouGov survey thought world war three was likely in the next five to 10 years.On Monday, Donald Trump stepped back from deepening the US and Israel’s war with Iran, announcing that he would postpone military strikes on Iranian power plants for a five-day period after “very