In a 48-hour whirlwind, President Donald Trump went from elated to indignant to triumphant as the fragile Israel-Iran ceasefire agreement came together, teetered toward collapse and ultimately coalesced.

President Donald Trump on Monday announced that Israel and Iran had agreed to a ceasefire, after more than a week of fighting following Israel's strikes -- and subsequent U.S. attacks -- on Iran's nuclear program.

The US president is due to arrive at the Nato summit shortly after earlier accusing Israel and Iran of violating the truce.