A liquefied natural gas terminal in Germany. Most of that L.N.G. comes from the United States, underscoring Europe’s vulnerability to American supplies.

Secretary of State Marco Rubio, center, during talks in Geneva on Sunday with Ukrainian officials on a plan to end the war with Russia.

President Cyril Ramaphosa of South Africa at the opening plenary session of the G20 summit on Saturday.

A German soldier demonstrating a drone jammer on Friday. If Europe builds a “drone wall,” it will be not a physical barrier but a network of trackers.

Firefighters in Odesa, Ukraine, this month after a Russian strike. President Trump warned Moscow that he would impose new economic punishments if it did not agree to a peace deal within 50 days.

A large-scale NATO military exercise involving nine allied nations, earlier this year.

A section of Hadrian’s Aqueduct in Athens. Its 15-mile network runs beneath the city and is still functional.

Members of the Ukrainian military trained on a Leopard-1A5 tank before moving forward to the front line for battle in the Kharkiv region of Ukraine in December.

At age 20, Kristin Smith’s mother arranged for her to have a tubal ligation.

Former President Nicolas Sarkozy of France arriving for a meeting on the Russian attack of Ukraine in Paris in February 2022.