Russian doctor, Andrei Volna (C) takes part in a surgery of 35-year-old Ukrainian soldier, who lost part of his leg during Russia's devastating siege of the port city of Mariupol, in the military hospital in Ukrainian capital of Kyiv on January 27, 2024, amid the Russian invasion of Ukraine. Andrei Volna lost faith in Russia. The surgeon's disillusionment passed the point of no return as he fled as Russian tanks entered Ukraine. The 61-year-old left behind a comfortable life in Moscow, with his wife and three children in tow, determined to use his medical skills to help Ukrainians. Settled in Kyiv since September 2023 after securing permission to volunteer in Kyiv, he now mainly treats troops who suffered fractures from blasts. (Photo by Sergei SUPINSKY / AFP)

A 35-year-old Ukrainian soldier, who lost part of his leg during Russia's devastating siege of the port city of Mariupol, patient of Andrei Volna, well known Russian doctor, waits prior to surgery in the military hospital in Ukrainian capital of Kyiv, on January 27, 2024, amid the Russian invasion of Ukraine. Andrei Volna lost faith in Russia. The surgeon's disillusionment passed the point of no return as he fled as Russian tanks entered Ukraine. The 61-year-old left behind a comfortable life in Moscow, with his wife and three children in tow, determined to use his medical skills to help Ukrainians. Settled in Kyiv since September 2023 after securing permission to volunteer in Kyiv, he now mainly treats troops who suffered fractures from blasts. (Photo by Sergei SUPINSKY / AFP)

Russian doctor, Andrei Volna (C) takes part in a surgery of 35-year-old Ukrainian soldier, who lost part of his leg during Russia's devastating siege of the port city of Mariupol, in the military hospital in Ukrainian capital of Kyiv on January 27, 2024, amid the Russian invasion of Ukraine. Andrei Volna lost faith in Russia. The surgeon's disillusionment passed the point of no return as he fled as Russian tanks entered Ukraine. The 61-year-old left behind a comfortable life in Moscow, with his wife and three children in tow, determined to use his medical skills to help Ukrainians. Settled in Kyiv since September 2023 after securing permission to volunteer in Kyiv, he now mainly treats troops who suffered fractures from blasts. (Photo by Sergei SUPINSKY / AFP)

Russian doctor, Andrei Volna (2nd L), takes part in a surgery of 35-year-old Ukrainian soldier, who lost part of his leg during Russia's devastating siege of the port city of Mariupol, in the military hospital in Ukrainian capital of Kyiv on January 27, 2024, amid the Russian invasion of Ukraine. Andrei Volna lost faith in Russia. The surgeon's disillusionment passed the point of no return as he fled as Russian tanks entered Ukraine. The 61-year-old left behind a comfortable life in Moscow, with his wife and three children in tow, determined to use his medical skills to help Ukrainians. Settled in Kyiv since September 2023 after securing permission to volunteer in Kyiv, he now mainly treats troops who suffered fractures from blasts. (Photo by Sergei SUPINSKY / AFP)

A 35-year-old Ukrainian soldier, who lost part of his leg during Russia's devastating siege of the port city of Mariupol, patient of Andrei Volna, well known Russian doctor, waits prior to surgery in the military hospital in Ukrainian capital of Kyiv, on January 27, 2024, amid the Russian invasion of Ukraine. Andrei Volna lost faith in Russia. The surgeon's disillusionment passed the point of no return as he fled as Russian tanks entered Ukraine. The 61-year-old left behind a comfortable life in Moscow, with his wife and three children in tow, determined to use his medical skills to help Ukrainians. Settled in Kyiv since September 2023 after securing permission to volunteer in Kyiv, he now mainly treats troops who suffered fractures from blasts. (Photo by Sergei SUPINSKY / AFP)

Russian doctor, Andrei Volna (R) talks to AFP joutnalists prior to a surgery on a 35-year-old Ukrainian soldier, who lost part of his leg during Russia's devastating siege of the port city of Mariupol, in the military hospital in Ukrainian capital of Kyiv on January 27, 2024, amid the Russian invasion of Ukraine. Andrei Volna lost faith in Russia. The surgeon's disillusionment passed the point of no return as he fled as Russian tanks entered Ukraine. The 61-year-old left behind a comfortable life in Moscow, with his wife and three children in tow, determined to use his medical skills to help Ukrainians. Settled in Kyiv since September 2023 after securing permission to volunteer in Kyiv, he now mainly treats troops who suffered fractures from blasts. (Photo by Sergei SUPINSKY / AFP)

Russian doctor, Andrei Volna (C) takes part in a surgery of 35-year-old Ukrainian soldier, who lost part of his leg during Russia's devastating siege of the port city of Mariupol, in the military hospital in Ukrainian capital of Kyiv on January 27, 2024, amid the Russian invasion of Ukraine. Andrei Volna lost faith in Russia. The surgeon's disillusionment passed the point of no return as he fled as Russian tanks entered Ukraine. The 61-year-old left behind a comfortable life in Moscow, with his wife and three children in tow, determined to use his medical skills to help Ukrainians. Settled in Kyiv since September 2023 after securing permission to volunteer in Kyiv, he now mainly treats troops who suffered fractures from blasts. (Photo by Sergei SUPINSKY / AFP)

Russian doctor, Andrei Volna (2nd L) takes part in a surgery of 35-year-old Ukrainian soldier, who lost part of his leg during Russia's devastating siege of the port city of Mariupol, in the military hospital in Ukrainian capital of Kyiv on January 27, 2024, amid the Russian invasion of Ukraine. Andrei Volna lost faith in Russia. The surgeon's disillusionment passed the point of no return as he fled as Russian tanks entered Ukraine. The 61-year-old left behind a comfortable life in Moscow, with his wife and three children in tow, determined to use his medical skills to help Ukrainians. Settled in Kyiv since September 2023 after securing permission to volunteer in Kyiv, he now mainly treats troops who suffered fractures from blasts. (Photo by Sergei SUPINSKY / AFP)

Russian doctor, Andrei Volna (L) takes part in a surgery of 35-year-old Ukrainian soldier, who lost part of his leg during Russia's devastating siege of the port city of Mariupol, in the military hospital in Ukrainian capital of Kyiv on January 27, 2024, amid the Russian invasion of Ukraine. Andrei Volna lost faith in Russia. The surgeon's disillusionment passed the point of no return as he fled as Russian tanks entered Ukraine. The 61-year-old left behind a comfortable life in Moscow, with his wife and three children in tow, determined to use his medical skills to help Ukrainians. Settled in Kyiv since September 2023 after securing permission to volunteer in Kyiv, he now mainly treats troops who suffered fractures from blasts. (Photo by Sergei SUPINSKY / AFP)

Assistant of Russian doctor Andrei Volna (not in the picture) examines a leg of 35-year-old Ukrainian soldier, who lost part of his leg during Russia's devastating siege of the port city of Mariupol, in the military hospital in Ukrainian capital of Kyiv on January 27, 2024, amid the Russian invasion of Ukraine. Andrei Volna lost faith in Russia. The surgeon's disillusionment passed the point of no return as he fled as Russian tanks entered Ukraine. The 61-year-old left behind a comfortable life in Moscow, with his wife and three children in tow, determined to use his medical skills to help Ukrainians. Settled in Kyiv since September 2023 after securing permission to volunteer in Kyiv, he now mainly treats troops who suffered fractures from blasts. (Photo by Sergei SUPINSKY / AFP)

Russian doctor, Andrei Volna (R) takes part in a surgery of 35-year-old Ukrainian soldier, who lost part of his leg during Russia's devastating siege of the port city of Mariupol, in the military hospital in Ukrainian capital of Kyiv on January 27, 2024, amid the Russian invasion of Ukraine. Andrei Volna lost faith in Russia. The surgeon's disillusionment passed the point of no return as he fled as Russian tanks entered Ukraine. The 61-year-old left behind a comfortable life in Moscow, with his wife and three children in tow, determined to use his medical skills to help Ukrainians. Settled in Kyiv since September 2023 after securing permission to volunteer in Kyiv, he now mainly treats troops who suffered fractures from blasts. (Photo by Sergei SUPINSKY / AFP)

A nurse, assistant of Russian doctor Andrei Volna (not pictured), rests after surgery a 35-year-old Ukrainian soldier, who lost part of his leg during Russia's devastating siege of the port city of Mariupol, in the military hospital in Ukrainian capital of Kyiv on January 27, 2024, amid the Russian invasion of Ukraine. Andrei Volna lost faith in Russia. The surgeon's disillusionment passed the point of no return as he fled as Russian tanks entered Ukraine. The 61-year-old left behind a comfortable life in Moscow, with his wife and three children in tow, determined to use his medical skills to help Ukrainians. Settled in Kyiv since September 2023 after securing permission to volunteer in Kyiv, he now mainly treats troops who suffered fractures from blasts. (Photo by Sergei SUPINSKY / AFP)

Russian doctor, Andrei Volna (C) takes part in a surgery of 35-year-old Ukrainian soldier, who lost part of his leg during Russia's devastating siege of the port city of Mariupol, in the military hospital in Ukrainian capital of Kyiv on January 27, 2024, amid the Russian invasion of Ukraine. Andrei Volna lost faith in Russia. The surgeon's disillusionment passed the point of no return as he fled as Russian tanks entered Ukraine. The 61-year-old left behind a comfortable life in Moscow, with his wife and three children in tow, determined to use his medical skills to help Ukrainians. Settled in Kyiv since September 2023 after securing permission to volunteer in Kyiv, he now mainly treats troops who suffered fractures from blasts. (Photo by Sergei SUPINSKY / AFP)

Russian doctor, Andrei Volna (2nd R) takes off a medical gowns after surgery of 35-year-old Ukrainian soldier, who lost part of his leg during Russia's devastating siege of the port city of Mariupol, in the military hospital in Ukrainian capital of Kyiv on January 27, 2024, amid the Russian invasion of Ukraine. Andrei Volna lost faith in Russia. The surgeon's disillusionment passed the point of no return as he fled as Russian tanks entered Ukraine. The 61-year-old left behind a comfortable life in Moscow, with his wife and three children in tow, determined to use his medical skills to help Ukrainians. Settled in Kyiv since September 2023 after securing permission to volunteer in Kyiv, he now mainly treats troops who suffered fractures from blasts. (Photo by Sergei SUPINSKY / AFP)

Russian doctor, Andrei Volna (C), takes part in a surgery of 35-year-old Ukrainian soldier, who lost part of his leg during Russia's devastating siege of the port city of Mariupol, in the military hospital in Ukrainian capital of Kyiv on January 27, 2024, amid the Russian invasion of Ukraine. Andrei Volna lost faith in Russia. The surgeon's disillusionment passed the point of no return as he fled as Russian tanks entered Ukraine. The 61-year-old left behind a comfortable life in Moscow, with his wife and three children in tow, determined to use his medical skills to help Ukrainians. Settled in Kyiv since September 2023 after securing permission to volunteer in Kyiv, he now mainly treats troops who suffered fractures from blasts. (Photo by Sergei SUPINSKY / AFP)

Russian doctor, Andrei Volna rests after surgery a 35-year-old Ukrainian soldier, who lost part of his leg during Russia's devastating siege of the port city of Mariupol, in the military hospital in Ukrainian capital of Kyiv on January 27, 2024, amid the Russian invasion of Ukraine. Andrei Volna lost faith in Russia. The surgeon's disillusionment passed the point of no return as he fled as Russian tanks entered Ukraine. The 61-year-old left behind a comfortable life in Moscow, with his wife and three children in tow, determined to use his medical skills to help Ukrainians. Settled in Kyiv since September 2023 after securing permission to volunteer in Kyiv, he now mainly treats troops who suffered fractures from blasts. (Photo by Sergei SUPINSKY / AFP)

Russian doctor, Andrei Volna (L), and Ukrainian Petro Nikitin (R), the head of the traumatology department, examine the patient in military hospital in Ukrainian capital of Kyiv on January 26, 2024, amid the Russian invasion of Ukraine. Andrei Volna lost faith in Russia. The surgeon's disillusionment passed the point of no return as he fled as Russian tanks entered Ukraine. The 61-year-old left behind a comfortable life in Moscow, with his wife and three children in tow, determined to use his medical skills to help Ukrainians. Settled in Kyiv since September 2023 after securing permission to volunteer in Kyiv, he now mainly treats troops who suffered fractures from blasts. (Photo by Sergei SUPINSKY / AFP)

Russian doctor, Andrei Volna talks to AFP journalists, in the military hospital in Ukrainian capital of Kyiv on January 26, 2024, amid the Russian invasion of Ukraine, amid the Russian invasion of Ukraine. Andrei Volna lost faith in Russia. The surgeon's disillusionment passed the point of no return as he fled as Russian tanks entered Ukraine. The 61-year-old left behind a comfortable life in Moscow, with his wife and three children in tow, determined to use his medical skills to help Ukrainians. Settled in Kyiv since September 2023 after securing permission to volunteer in Kyiv, he now mainly treats troops who suffered fractures from blasts. (Photo by Sergei SUPINSKY / AFP)

A 35-year-old Ukrainian soldier, who lost part of his leg during Russia's devastating siege of the port city of Mariupol, a patient of Andrei Volna, well known Russian doctor, enters in his hospital room in the military hospital in Ukrainian capital of Kyiv, on January 26, 2024, amid the Russian invasion of Ukraine. Andrei Volna lost faith in Russia. The surgeon's disillusionment passed the point of no return as he fled as Russian tanks entered Ukraine. The 61-year-old left behind a comfortable life in Moscow, with his wife and three children in tow, determined to use his medical skills to help Ukrainians. Settled in Kyiv since September 2023 after securing permission to volunteer in Kyiv, he now mainly treats troops who suffered fractures from blasts. (Photo by Sergei SUPINSKY / AFP)

Russian doctor, Andrei Volna talks to AFP journalists, in the military hospital in Ukrainian capital of Kyiv on January 26, 2024, amid the Russian invasion of Ukraine. Andrei Volna lost faith in Russia. The surgeon's disillusionment passed the point of no return as he fled as Russian tanks entered Ukraine. The 61-year-old left behind a comfortable life in Moscow, with his wife and three children in tow, determined to use his medical skills to help Ukrainians. Settled in Kyiv since September 2023 after securing permission to volunteer in Kyiv, he now mainly treats troops who suffered fractures from blasts. (Photo by Sergei SUPINSKY / AFP)