The new Trump foreign policy team has brought a dizzying message to European allies on A.I., Ukraine and more. It has already left many angered and chagrined.

President Volodymyr Zelensky of Ukraine and European defense ministers had expressed concern that they might not be present for talks between President Trump and Russia’s leader to end the war.

The messages showed that F.B.I. investigators took normal bureaucratic steps and precautions when opening an extraordinarily sensitive inquiry into Mr. Trump’s attempts to overturn the 2020 election.