New Delhi, Sept. 23 -- NEW YORK - The Gaza ceasefire that Donald Trump promised to deliver in his first week is still not signed. The Ukraine war he said would end on his first day has now entered its fourth year. And on Tuesday, with the United Nations General Assembly as backdrop, the president arrived in New York carrying those incomplete promises in one hand and a Greenland territorial agreement in the other.

Trump's address to the 81st session of the General Assembly fell on a day when the hall's most immediate preoccupation was not diplomacy in the conventional sense but the management of an active war. Seven months into a US-Israeli campaign against Iran's nuclear and military infrastructure, the question hanging over Turtle Bay w...