NATO Secretary General Mark Rutte's planned U.S. visit, announced April 4, includes scheduled talks with President Trump amid alliance strains, following Trump's April 1 national address expressing intent to exit NATO and claiming Iran's war objectives near completion. Traders focus on this confirmed diplomacy as the primary near-term catalyst, with no other April conversations verified yet despite paused U.S.-Israeli strikes on Iran until April 6 to allow negotiations. Ongoing Middle East tensions and Ukraine dynamics could prompt outreach to leaders like Macron or Zelenskyy, but Rutte's trip stands out; a U.K.-hosted Hormuz Strait summit adds regional pressure, while a potential late-April U.K. royal visit offers another opportunity. Markets track public phone calls, interviews, or meetings resolving end-April.