Center on Europe and Eurasia

Russian President Vladimir Putin watches a naval exercise from the Marshal Ustinov missile cruiser in the Black Sea on January 9, 2020. (Anadolu Agency via Getty Images)

An Iranian citizen holds a placard in Tehran during a demonstration to support Iran's drone and missile attacks on Israel on April 15, 2024. (Photo by Fatemeh Bahrami/Anadolu via Getty Images)

A member of a Ukrainian artillery brigade during a training session near Chasiv Yar, Ukraine, on February 27, 2024. (Photo by Cristopher Rogel Blanquet/Getty Images)

A Ukrainian serviceman holds a Stinger anti-aircraft weapon onboard a Maritime Guard of the State Border Service of Ukraine boat as it patrols in the northwestern Black Sea on December 18, 2023. (Anatolii Stepanov via Getty Images)

Ukrainian servicemen fire a French-made CAESAR self-propelled howitzer toward Russian positions in eastern Ukraine on December 28, 2022. (Photo by Sameer al-Doumy/AFP via Getty Images)

Ukrainian soldiers participate in a military training drill at an undisclosed location in Donetsk Oblast, Ukraine, on March 6, 2024. (Jose Colon via Getty Images)

Speaker of the House Mike Johnson makes remarks during a Congressional Gold Medal ceremony to honor World War II veterans in Emancipation Hall on Thursday, March 21, 2024. (Tom Williams via Getty Images)

An SU-27 of the Ukrainian Air Force on final approach at Kleine Brogel Military Air Base in Belgium on September 13, 2019. (Nicolas Economou via Getty Images)

A man suspected of taking part in the attack of a concert hall that killed 137 people is escorted by Russian law enforcement officers at the Basmanny District Court in Moscow on March 24, 2024. (Photo by Olga Maltseva/AFP via Getty Images)

A Ukrainian mortar team near Toretsk, Ukraine, on March 26, 2024. (Wolfgang Schwan via Getty Images)

Texas national guardsmen arrive at the El Paso airport on March 26, 2024 in El Paso, Texas. (Photo by Brandon Bell/Getty Images)