Center on Europe and Eurasia

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)

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 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)

Russian President Vladimir Putin, accompanied by Defence Minister Sergei Shoigu and Commander-in-Chief of the Russian Navy, Admiral Nikolai Yevmenov, attending the Navy Day parade in Saint Petersburg on July 30, 2023. (Alexander Kazakov via Getty Images)

A Swedish CB90-class fast assault craft approaches the well deck of the Whidbey Island-class dock landing ship USS Gunston Hall during exercise Steadfast Defender 24 on March 6, 2024, in the Norwegian Sea. (US Navy photo by Mass Communication Specialist 1st Class Danielle Serocki)

Ukrainian soldiers of the 79th brigade in the frontline city of Vuhledar, Ukraine, on March 12, 2024. (Photo by Wolfgang Schwan/Anadolu via Getty Images)