KYIV: Kyiv launched one of the biggest drone attacks on Russia since the full-scale war began, targeting power plants and an oil refinery overnight, while Moscow's forces made further advances towards a key town in eastern Ukraine, officials said on Sunday (Aug 1).

Russian missile strikes on Kharkiv injured more than 40 people, including five children, prompting Ukrainian President Volodymyr Zelenskyy to renew calls on allies to allow Kyiv to fire Western-supplied missiles deeper into enemy territory and reduce the threat of attack.

The fighting comes at a critical juncture in the two-and-a-half year conflict, with Russia pressing an offensive in eastern Ukraine while trying to expel Ukrainian forces that broke through its western border in a surprise incursion on Aug 6.

Russia last week pounded Ukraine with its heaviest air strikes of the war, hitting energy facilities, part of a campaign of drone and missile barrages that have killed thousands of civilians and troops since the conflict began in February 2022.

Ukraine, with a rapidly expanding domestic drone industry, has stepped up its own attacks on Russian energy, military and transport infrastructure.

It is also pressing the United States and other allies for permission to use more powerful Western-supplied weapons to inflict greater damage inside Russia and impair Moscow's abilities to attack Ukraine.

"All necessary forces for the rescue operation have been brought in," Zelenskyy said on his Telegram channel, in response to the Kharkiv attack that officials said involved at least 10 missiles and struck locations including a shopping mall.

"And all the necessary forces of the world must be brought in to stop this terror. This does not require extraordinary forces, but enough courage on the part of the leaders - courage to give Ukraine what it needs to defend itself."

In Kharkiv, rescue workers and volunteers carried injured civilians to ambulances after missiles struck the mall and an events hall. Shattered glass and debris were strewn across the ground and people fled to a metro station for safety.