Commuters take the subway in Kharkiv, eastern Ukraine, Tuesday, May 24, 2022. Kharkiv subway resumed service on Tuesday morning after it was closed for more than two months during Russian attempt to capture the city. (AP Photo/Bernat Armangue)

Commuters take the subway in Kharkiv, eastern Ukraine, Tuesday, May 24, 2022. Kharkiv subway resumed service on Tuesday morning after it was closed for more than two months during Russian attempt to capture the city. (AP Photo/Bernat Armangue)

Commuters take the subway in Kharkiv, eastern Ukraine, Tuesday, May 24, 2022. Kharkiv subway resumed service on Tuesday morning after it was closed for more than two months during Russian attempt to capture the city. (AP Photo/Bernat Armangue)

Commuters take the subway in Kharkiv, eastern Ukraine, Tuesday, May 24, 2022. Kharkiv subway resumed service on Tuesday morning after it was closed for more than two months during Russian attempt to capture the city. (AP Photo/Bernat Armangue)

Commuters take the subway in Kharkiv, eastern Ukraine, Tuesday, May 24, 2022. Kharkiv subway resumed service on Tuesday morning after it was closed for more than two months during Russian attempt to capture the city. (AP Photo/Bernat Armangue)

People wait on a platform at Kharkiv's metro in Kharkiv, eastern Ukraine, on May 24, 2022, amid the Russian invasion of Ukraine. - After nearly three months of interruption due to the Russian offensive on the second largest city in Ukraine, the Kharkiv metro, which for a long time hosted people protecting themselves from artillery fire, resumed on May 24, 2022. (Photo by Dimitar DILKOFF / AFP)

People wait on a platform at Kharkiv's metro in Kharkiv, eastern Ukraine, on May 24, 2022, amid the Russian invasion of Ukraine. - After nearly three months of interruption due to the Russian offensive on the second largest city in Ukraine, the Kharkiv metro, which for a long time hosted people protecting themselves from artillery fire, resumed on May 24, 2022. (Photo by Dimitar DILKOFF / AFP)

People wait on a platform at Kharkiv's metro in Kharkiv, eastern Ukraine, on May 24, 2022, amid the Russian invasion of Ukraine. - After nearly three months of interruption due to the Russian offensive on the second largest city in Ukraine, the Kharkiv metro, which for a long time hosted people protecting themselves from artillery fire, resumed on May 24, 2022. (Photo by Dimitar DILKOFF / AFP)

People walk on a platform at Kharkiv's metro in Kharkiv, eastern Ukraine, on May 24, 2022, amid the Russian invasion of Ukraine. - After nearly three months of interruption due to the Russian offensive on the second largest city in Ukraine, the Kharkiv metro, which for a long time hosted people protecting themselves from artillery fire, resumed on May 24, 2022. (Photo by Dimitar DILKOFF / AFP)

A couple wait on a platform at Kharkiv's metro in Kharkiv, eastern Ukraine, on May 24, 2022, amid the Russian invasion of Ukraine. - After nearly three months of interruption due to the Russian offensive on the second largest city in Ukraine, the Kharkiv metro, which for a long time hosted people protecting themselves from artillery fire, resumed on May 24, 2022. (Photo by Dimitar DILKOFF / AFP)

People ride a metro in Kharkiv, eastern Ukraine, on May 24, 2022, amid the Russian invasion of Ukraine. - After nearly three months of interruption due to the Russian offensive on the second largest city in Ukraine, the Kharkiv metro, which for a long time hosted people protecting themselves from artillery fire, resumed on May 24, 2022. (Photo by Dimitar DILKOFF / AFP)

People ride a metro in Kharkiv, eastern Ukraine, on May 24, 2022, amid the Russian invasion of Ukraine. - After nearly three months of interruption due to the Russian offensive on the second largest city in Ukraine, the Kharkiv metro, which for a long time hosted people protecting themselves from artillery fire, resumed on May 24, 2022. (Photo by Dimitar DILKOFF / AFP)

People ride a metro in Kharkiv, eastern Ukraine, on May 24, 2022, amid the Russian invasion of Ukraine. - After nearly three months of interruption due to the Russian offensive on the second largest city in Ukraine, the Kharkiv metro, which for a long time hosted people protecting themselves from artillery fire, resumed on May 24, 2022. (Photo by Dimitar DILKOFF / AFP)

People ride a metro in Kharkiv, eastern Ukraine, on May 24, 2022, amid the Russian invasion of Ukraine. - After nearly three months of interruption due to the Russian offensive on the second largest city in Ukraine, the Kharkiv metro, which for a long time hosted people protecting themselves from artillery fire, resumed on May 24, 2022. (Photo by Dimitar DILKOFF / AFP)

People step out from a metro train in Kharkiv, eastern Ukraine, on May 24, 2022, amid the Russian invasion of Ukraine. - After nearly three months of interruption due to the Russian offensive on the second largest city in Ukraine, the Kharkiv metro, which for a long time hosted people protecting themselves from artillery fire, resumed on May 24, 2022. (Photo by Dimitar DILKOFF / AFP)

People walk out of an underground passage of Kharkiv's metro in Kharkiv, eastern Ukraine, on May 24, 2022, amid the Russian invasion of Ukraine. - After nearly three months of interruption due to the Russian offensive on the second largest city in Ukraine, the Kharkiv metro, which for a long time hosted people protecting themselves from artillery fire, resumed on May 24, 2022. (Photo by Dimitar DILKOFF / AFP)