The president had been on something of a winning streak. But when faced with facts and foes that wouldn’t bend to his will, he responded with impatience and disproportionate intensity.
In a social media post, the president described the move as a deterrent prompted by threats by a former Russian leader. It is unclear if any submarines did actually change position.
Dmitri Medvedev, Russia’s former president who now serves in a largely symbolic role, frequently wields nuclear threats against the West on social media.
Mr. Trump appeared to accept that the personal diplomacy he has tried to wield has failed, and issued an ultimatum that if Russia did not agree to a peace deal in two weeks, the United States would impose tariffs and sanctions on the country.