NATO allies unveiled billions in defense industry deals to buy next-generation drones and surveillance planes — and convince US President Donald Trump that Europe is heeding his spending demands.

President Donald Trump plans to meet with Ukrainian President Volodymyr Zelenskyy and Syrian President Ahmad al-Sharaa on Wednesday while attending the NATO summit in Turkey, the White House said.

The speed with which most NATO countries have tried to heed Trump’s call to spend 5% of their annual gross domestic product on defense over the next decade underscores how the U.S. president has resha...