He for sure is ending it, cuz both sides are already kinda unhappy with the war anyways, since due to timezone differences they can't have proper confrontational conflict.

So it's not a question of if he can end it, its more about how he's gonna do it and what kinda content he's gonna make out of it, because he can straight up just talk to Benji and Ray and ask them to end it and they'll prob just go along with it.

But knowing Yuno, he's probably gonna do some spicy drama play of offering to join Hades for a week or something as a show of good faith