Washington, April 9 -- President Donald Trump over the course of a day went from threatening Iran with "annihilation" to proclaiming that the battered Islamic Republic's leadership had presented a "workable" plan that led him to agree to a 14-day ceasefire that he expects to pave the way to end the nearly six-week-old war. The dramatic shift in tenor came as intermediaries led by Pakistan worked feverishly to head off a further escalation. Even China, Iran's biggest trading partner and America's most significant economic competitor, quietly pulled strings to find a path toward a ceasefire, according to two officials briefed on the matter. As Trump boasted about US and Israeli military success over the last six weeks, he appeared to be worki...