President Donald Trump holds talks this week with French President Emmanuel Macron and British Prime Minister Keir Starmer at a moment of deep uncertainty about the future of transatlantic relations.

LONDON — The leaders of France and Britain are making tag-team visits to Washington this week as Europe attempts to persuade President Donald Trump not to abandon Ukraine in pursuit of a peace deal in the three-year-old war with Russia.

As he began his attack, the 37-year-old was heard shouting, “Allahu akbar,” according to France’s antiterrorism police. The Arabic phrase, meaning “God is great,” is an everyday expression used in religious and nonreligious settings alike, but has also become a war cry in some terrorist attacks by Islamic fundamentalists.

The man injured two police officers seriously, one in the neck and one in the chest. A 69-year-old Portuguese man who tried to intervene was stabbed and killed. The suspect was subject to a deportation order because he was on a terrorism watch list,