A Ukrainian flag is seen in Kyiv, Ukraine on June 28, 2022.　( The Yomiuri Shimbun via AP Images )

A wheat field under the blue sky is pictured in the suburb of Kyiv, Ukraine on June 29, 2022.　( The Yomiuri Shimbun via AP Images )

Women wear yellow and blue, colours of Ukraine flag, shirts in Kyiv, Ukraine on June 28, 2022.　( The Yomiuri Shimbun via AP Images )

A Ukrainian flag is seen in Kyiv, Ukraine on June 28, 2022.　( The Yomiuri Shimbun via AP Images )

A wheat field under the blue sky is pictured in the suburb of Kyiv, Ukraine on June 29, 2022.　( The Yomiuri Shimbun via AP Images )

A roof is coloured in yellow and blue, Ukrainian flag's colours, in the suburb of Kyiv, Ukraine on June 29, 2022.　( The Yomiuri Shimbun via AP Images )

The Ukrainian flag flys on a pole in the middle of a land of wheat, in Kyiv, Ukraine, Wednesday, June 29, 2022. (AP Photo/Nariman El-Mofty)

Russian soldiers guard an area next to a field of wheat as foreign journalists work in the Zaporizhzhia region in an area under Russian military control, southeastern Ukraine, Tuesday, June 14, 2022. The Zaporizhzhia region has been under control of the Russian forces since the early days of the Russian military action in Ukraine. This photo was taken during a trip organized by the Russian Ministry of Defense. (AP Photo)

Russian soldiers guard an area next to a field of wheat as foreign journalists work in the Zaporizhzhia region in an area under Russian military control, southeastern Ukraine, Tuesday, June 14, 2022. The Zaporizhzhia region has been under control of the Russian forces since the early days of the Russian military action in Ukraine. This photo was taken during a trip organized by the Russian Ministry of Defense. (AP Photo)

Combine harvesters harvest wheat on a field near Izmail, in the Odessa region on June 14, 2022, amid the Russian invasion of Ukraine. - In the Ukrainian port of Izmail, on the Danube river that marks the border with Romania, rows of trucks filled with grain stand in line. (Photo by Oleksandr GIMANOV / AFP)

A photograph shows a wheat field at a farm in southern Ukraine’s Mykolaiv region, on June 11, 2022, amid the Russian invasion of Ukraine. (Photo by Genya SAVILOV / AFP)

A photograph shows a wheat field at a farm in southern Ukraine’s Mykolaiv region, on June 11, 2022, amid the Russian invasion of Ukraine. (Photo by Genya SAVILOV / AFP)

A photograph shows a wheat field at a farm in southern Ukraine’s Mykolaiv region, on June 11, 2022, amid the Russian invasion of Ukraine. (Photo by Genya SAVILOV / AFP)

A photograph shows a wheat field at a farm in southern Ukraine’s Mykolaiv region, on June 11, 2022, amid the Russian invasion of Ukraine. (Photo by Genya SAVILOV / AFP)

A photograph shows a wheat field at a farm in southern Ukraine’s Mykolaiv region, on June 11, 2022, amid the Russian invasion of Ukraine. (Photo by Genya SAVILOV / AFP)

A photograph shows anti-tank obstacles on a wheat field at a farm in southern Ukraine’s Mykolaiv region, on June 11, 2022, amid the Russian invasion of Ukraine. (Photo by Genya SAVILOV / AFP)