KYIV, Ukraine (AP) — Russian attacks on Ukraine killed six people, including a child, and wounded 29, officials said on Saturday, adding that Ukrainian forces damaged more than two dozen Russian tankers and other vessels in the Sea of Azov.

The exchange came as Ukraine’s drones have lately been hitting oil refineries and other infrastructure across Russia to undercut its war effort, triggering a widespread fuel crisis with gasoline shortages. Moscow has responded by intensifying its bombardment on Kyiv and other cities, exposing Ukraine’s vulnerability to ballistic missile strikes.