The United States and China wrapped up a two-day presidential summit here by announcing a 100-day plan to improve strained trade ties and boost cooperation between the rival nations.

But they appeared to reach no clear path forward on North Korea, and the Trump administration’s unexpected military strike in Syria — launched on the summit’s first day — highlighted an area where President Trump and counterpart Xi Jinping differ sharply.

Trump aides who participated in the talks described a productive first meeting between the leaders, saying they exhibited “positive” chemistry. Commerce Secretary Wilbur Ross said the two sides agreed to speed up trade talks to help close a lopsided imbalance in China’s favor, a common campaign-trail complaint of Trump’s.

“This may be ambitious, but it’s a big sea change in the pace of discussions,” Ross said. “It’s important symbolism of the growing rapport between the two countries.”