Leaders from across the European Union are meeting Thursday in a Belgian castle as the 27-nation bloc faces antagonism from U.S. President Donald Trump, strong-arm economic tactics from China and hybrid threats from Russia — challenges that have prompted a rethink of Europe's approach to diplomacy and trade.

"We all know we must change course, and we all know the direction," Belgian Prime Minister Bart De Wever told a meeting of some European leaders on Wednesday. "Yet it sometimes feels like we're standing on the bridge of the ship staring at the horizon without being able to touch the helm."