The problem with any statements about WWIII, if made during an election period, is that they intimidate the average citizen and lead them to vote for Trump and his destructive isolationist policy. Such statements are either deliberately made to achieve exactly this result or due to a lack of knowledge about the fact that absolutely any threatening declarations by Putin on nuclear war are pure lies and bluster. In 2022, even some totally incompetent people from Biden’s administration believed in this bluster seriously, and then imagined they had prevented a nuclear war. What a shame.
What will definitely lead to WWIII with 100% probability is a policy of non-intervention, NATO deconstruction, and concessions to all totalitarian frostbites, which any concessions are perceived as weakness and an invitation for the immediate start or continuation of aggressive unrestrained actions.
A second Trump term really is an extinction-level threat to democracy worldwide, not just in United States. Considering that Trump and his supporters promise an isolationist policy, all sorts of predatory authoritarian and totalitarian regimes will suddenly feel like they can do anything - and this will start happening all over the world.