Medical workers, helped by a member of Doctors Without Borders (MSF), transfer a wounded civilian patient from a train to an ambulance upon his arrival from the east of Ukraine in the western Ukrainian city of Lviv on March 22, 2023. - Doctors Without Borders (MSF), in cooperation with the Ukrainian railways and the Ministry of Health, has just completed a medical train referral of patients, coming from the east of Ukraine. (Photo by YURIY DYACHYSHYN / AFP)

Medical workers, helped by a member of Doctors Without Borders (MSF), transfer a wounded civilian patient from a train to an ambulance upon his arrival from the east of Ukraine in the western Ukrainian city of Lviv on March 22, 2023. - Doctors Without Borders (MSF), in cooperation with the Ukrainian railways and the Ministry of Health, has just completed a medical train referral of patients, coming from the east of Ukraine. (Photo by YURIY DYACHYSHYN / AFP)

Medical workers transfer a wounded civilian patient from a train to an ambulance upon his arrival from the east of Ukraine in the western Ukrainian city of Lviv on March 22, 2023. - Doctors Without Borders (MSF), in cooperation with the Ukrainian railways and the Ministry of Health, has just completed a medical train referral of patients, coming from the east of Ukraine. (Photo by YURIY DYACHYSHYN / AFP)

Medical workers transfer a wounded civilian patient from a train to an ambulance upon his arrival from the east of Ukraine in the western Ukrainian city of Lviv on March 22, 2023. - Doctors Without Borders (MSF), in cooperation with the Ukrainian railways and the Ministry of Health, has just completed a medical train referral of patients, coming from the east of Ukraine. (Photo by YURIY DYACHYSHYN / AFP)

Medical workers transfer a wounded civilian patient from a train to an ambulance upon his arrival from the east of Ukraine in the western Ukrainian city of Lviv on March 22, 2023. - Doctors Without Borders (MSF), in cooperation with the Ukrainian railways and the Ministry of Health, has just completed a medical train referral of patients, coming from the east of Ukraine. (Photo by YURIY DYACHYSHYN / AFP)

Medical workers transfer a wounded civilian patient from a train to an ambulance upon his arrival from the east of Ukraine in the western Ukrainian city of Lviv on March 22, 2023. - Doctors Without Borders (MSF), in cooperation with the Ukrainian railways and the Ministry of Health, has just completed a medical train referral of patients, coming from the east of Ukraine. (Photo by YURIY DYACHYSHYN / AFP)

Medical workers, helped by a member of Doctors Without Borders (MSF), transfer a wounded civilian patient from a train to an ambulance upon his arrival from the east of Ukraine in the western Ukrainian city of Lviv on March 22, 2023. - Doctors Without Borders (MSF), in cooperation with the Ukrainian railways and the Ministry of Health, has just completed a medical train referral of patients, coming from the east of Ukraine. (Photo by YURIY DYACHYSHYN / AFP)

Medical workers transfer a wounded civilian patient from a train to an ambulance upon his arrival from the east of Ukraine in the western Ukrainian city of Lviv on March 22, 2023. - Doctors Without Borders (MSF), in cooperation with the Ukrainian railways and the Ministry of Health, has just completed a medical train referral of patients, coming from the east of Ukraine. (Photo by YURIY DYACHYSHYN / AFP)

Medical workers transfer a wounded civilian patient from a train to an ambulance upon his arrival from the east of Ukraine in the western Ukrainian city of Lviv on March 22, 2023. - Doctors Without Borders (MSF), in cooperation with the Ukrainian railways and the Ministry of Health, has just completed a medical train referral of patients, coming from the east of Ukraine. (Photo by YURIY DYACHYSHYN / AFP)

Medical workers transfer a wounded civilian patient from a train to an ambulance upon his arrival from the east of Ukraine in the western Ukrainian city of Lviv on March 22, 2023. - Doctors Without Borders (MSF), in cooperation with the Ukrainian railways and the Ministry of Health, has just completed a medical train referral of patients, coming from the east of Ukraine. (Photo by YURIY DYACHYSHYN / AFP)

Ukrainian medical workers wait for wounded civilian as they arrive from eastern Ukraine in Lviv on March 22, 2023, amid the Russian invasion of Ukraine. - Medecins Sans Frontieres (MSF), in cooperation with Ukrainian Railways and the Ministry of Health, has completed the transport of patients by train from eastern Ukraine. (Photo by YURIY DYACHYSHYN / AFP)

Ukrainian medical workers wait for wounded civilian as they arrive from eastern Ukraine in Lviv on March 22, 2023, amid the Russian invasion of Ukraine. - Medecins Sans Frontieres (MSF), in cooperation with Ukrainian Railways and the Ministry of Health, has completed the transport of patients by train from eastern Ukraine. (Photo by YURIY DYACHYSHYN / AFP)