Overnight, Moscow's missile and drone strikes have led to blackouts in multiple districts of Ukraine's capital, Kyiv.
Several individuals were injured while inhabitants in the city's east were plunged into darkness and encountered disruption to water systems, according to local authorities.
At the same time, a young boy was lost their life in a separate aerial attack in the Zaporizhzhia region in the southern area, based on information from local officials.
Moscow has increased strikes on power infrastructure over recent weeks, while Ukrainian leadership has demanded "substantial measures" from international partners to apply pressure on Moscow.
"What's needed is not symbolic gestures but decisive action - from the US, European nations and the G7 - in delivering defensive weapons and enforcing sanctions," he wrote in a social media post.
He said that hundreds of unmanned aircraft and several dozen rockets attacked energy facilities, describing such assaults as "cynical and calculated" and against "critical infrastructure" as temperatures become colder.
Energy officials said Moscow was "launching a major assault" and maintenance teams were working to restore power.
A wave of strikes damaged energy infrastructure and civilian homes in Kyiv.
Several of the people injured in the assaults on the capital have been transported for medical care, according to municipal representatives.
Regional authorities said the city experienced significant strikes throughout the evening. A seven-year-old child lost their life and several individuals were injured.
The assaults succeed evenings of aerial attacks in the area, parts of which are currently controlled by invading troops.
The entire country is under warning for hypersonic Kinzhal missile strikes, which are tougher to detect.
National leaders told journalists that Moscow was deliberately attempting to destroy the national power system, with assaults already affecting gas facilities.
Authorities confirmed utility staff and government agencies were preparing for further attacks.
