Center on Europe and Eurasia

President Donald Trump leads President Volodymyr Zelenskyy and other European leaders in the Cross Hall of the White House on August 18, 2025. (Aaron Schwartz via Getty Images)

President Donald Trump and Ukrainian President Volodymyr Zelenskyy pose for a picture with European leaders following a meeting at the White House on August 18, 2025. (Win McNamee via Getty Images)

The Royal Navy type 23 frigate HMS Lancaster coming into Portsmouth Harbour on March 31, 2021. (Andrew Matthews via Getty Images)

US President Donald Trump and Russian President Vladimir Putin shake hands during a meeting on the sidelines of the G20 Summit in Hamburg, Germany, on July 7, 2017. (Saul Loeb via Getty Images)

Russia's President Vladimir Putin attends a flag-raising ceremony for the latest Project 955A (Borey-A) strategic nuclear-powered submarine Knyaz Pozharsky in Severodvinsk on July 24, 2025. (Alexander Kazakov via Getty Images)

Ukrainian military personnel control the unmanned ground vehicle platform Rys Pro equipped with a remote-controlled machine-gun turret during training on April 18, 2025, in an unspecified area of Ukraine. (Serhii Mykhalchuk via Getty Images)

US President Donald Trump listens to questions from reporters after speaking on economic data in the Oval Office on August 7, 2025, in Washington, DC. (Win McNamee via Getty Images)

The Kerch Bridge connecting Russia to occupied Crimea is seen on October 13, 2022. (Stringer via Getty Images)

In this pool photograph distributed by the Russian state agency Sputnik, President Vladimir Putin meets with Moscow-installed head of the Donetsk region in Russian-controlled Ukraine, Denis Pushilin (not pictured), at the Kremlin in Moscow on August 4, 2025. (Mikhail Metzel via Getty Images)

US President Donald Trump joins hands with Azerbaijani President Ilham Aliyev, and Armenian Prime Minister Nikol Pashinyan during a signing ceremony in the White House on August 8, 2025, in Washington, DC. (Andrew Harnik via Getty Images)

Karol Nawrocki attends an event after the second round of the presidential election in Warsaw, Poland, on June 1, 2025. (Jakub Porzycki via Getty Images)

Ukrainian servicemen of a mobile air defense unit fire a Soviet-made ZU-23 anti-aircraft twin autocannon toward a Russian drone during an air attack near Pavlograd, Dnipropetrovsk Oblast, on July 19, 2025. (Roman Pilipey via Getty Images)