The fragile ceasefire between Israel and Iran appeared to be holding on Wednesday after a rocky start, giving rise to cautious hope for longer-term peace even as Tehran insisted it will not give up its nuclear program.

“If the Middle East is unstable, the world will not be at peace,” Chinese President Xi Jinping said June 19. “If the conflict escalates further, not only will the conflicting parties suffer greater losses, but regional countries will also suffer greatly.”

President Donald Trump said Israel and Iran both violated a cease-fire early Tuesday hours after it came into effect and urged Israel not to retaliate.