UNITED NATIONS >> Facing an escalating nuclear threat from North Korea and the mass flight of minority Muslims from Myanmar, world leaders gather at the United Nations starting Monday to tackle these and other tough challenges — from the spread of terrorism to a warming planet.

The spotlight will be on U.S. President Donald Trump and France’s new leader Emmanuel Macron, who will be making their first appearance at the General Assembly. They will be joined by more than 100 heads of state and government, including Zimbabwe’s President Robert Mugabe, who is said to be bringing a 70-member entourage.

While Trump’s speeches and meetings will be closely followed, it will be North Korea, which Secretary-General Antonio Guterres calls “the most dangerous crisis that we face today,” that will be the most carefully watched.