A newly constructed defensive position is seen in the field close to the Russian border in the Kharkiv region, Ukraine, on Wednesday, April 17, 2024. (AP Photo/Evgeniy Maloletka)
Workers ride by an excavator to construct new defensive positions close to the Russian border in the Kharkiv region, Ukraine, on Wednesday, April 17, 2024. (AP Photo/Evgeniy Maloletka)
Workers install ani-tank systems known as “dragon teeth” during construction new defensive positions close to the Russian border in Kharkiv region, Ukraine, on Wednesday, April 17, 2024. (AP Photo/Evgeniy Maloletka)
Anti-tank systems known as “dragon teeth” are seen in the field close to the Russian border in the Kharkiv region, Ukraine, on Wednesday, April 17, 2024. (AP Photo/Evgeniy Maloletka)
Workers construct new defensive positions close to the Russian border in Kharkiv region, Ukraine, on Wednesday, April 17, 2024. (AP Photo/Evgeniy Maloletka)
A worker constructs new defensive positions close to the Russian border in Kharkiv region, Ukraine, on Wednesday, April 17, 2024. (AP Photo/Evgeniy Maloletka)
A worker constructs new defensive positions close to the Russian border in Kharkiv region, Ukraine, on Wednesday, April 17, 2024. (AP Photo/Evgeniy Maloletka)
Workers install anti-tank defenses known as “dragon teeth” during construction of new defensive positions close to the Russian border in the Kharkiv region, Ukraine, on Wednesday, April 17, 2024. (AP Photo/Evgeniy Maloletka)
Workers construct new defensive positions close to the Russian border in Kharkiv region, Ukraine, on Wednesday, April 17, 2024. (AP Photo/Evgeniy Maloletka)
A worker constructs new defensive positions close to the Russian border in Kharkiv region, Ukraine, on Wednesday, April 17, 2024. (AP Photo/Evgeniy Maloletka)
A worker cuts wood for new defensive positions close to the Russian border in Kharkiv region, Ukraine, on Wednesday, April 17, 2024. (AP Photo/Evgeniy Maloletka)
Workers install anti-tank systems known as “dragon teeth” during construction new defensive positions close to the Russian border in Kharkiv region, Ukraine, on Wednesday, April 17, 2024. (AP Photo/Evgeniy Maloletka)
Workers construct new defensive positions close to the Russian border in Kharkiv region, Ukraine, on Wednesday, April 17, 2024. (AP Photo/Evgeniy Maloletka)