I don't think it's necessarily saying nothing though. Hidden in his bland statements will be stuff that's been agreed between the European leaders... even something as seemingly vapid as "alliances matter because they are built on respect and partnership, not pressure" is a rebuke, and an invitation to anyone left in the US administration who isn't nodding along to Trump's lunacy with enthusiasm to reconsider. It's vanishingly unlikely, I'll admit, but I imagine that there are diplomatic threats being transmitted behind the scenes, as well as offering off-ramps for de-escalating.
Unfortunately, Trump is still the most powerful and dangerous person in the world, despite being a complete raving lunatic.