1. It’s begun.

President Trump and Kim Jong-un of North Korea shook hands at the start of their first face-to-face meeting in Singapore this morning, in one of the most closely watched events in history.

Our team of reporters is covering every angle in real time. Follow along here.

Mr. Trump exuded confidence before the meeting (he and his team had lunch with Singapore’s prime minister on Monday). But he has never faced off with an adversary like Mr. Kim. Nor have the stakes of his negotiations been so high. The United States hopes North Korea will rid itself of its nuclear arsenal, while North Korea wants American weapons out of the Korean peninsula.

Here’s our breakdown of the basics. And one thing to keep in mind: Nuclear disarmament in North Korea would be a monumental task. The sides may not even have the same definition of denuclearization.