Overnight, Russian missile and drone strikes have resulted in power cuts in large parts of Ukraine's capital, Kyiv.
Nine people were injured while inhabitants in eastern neighborhoods were plunged into darkness and encountered problems to water systems, according to city officials.
Meanwhile, a seven-year-old child was killed in a separate aerial attack in the Zaporizhzhia area in the southern area, based on information from local officials.
Russian forces has intensified strikes on energy facilities over recent weeks, while Ukrainian leadership has called for "real steps" from allies to exert influence on Russia.
"What's needed is not symbolic gestures but decisive action - from the US, European nations and the Group of Seven - in providing protection systems and implementing penalties," he wrote in a online statement.
Authorities reported that hundreds of unmanned aircraft and more than 30 projectiles struck energy facilities, characterizing such attacks as "strategic and deliberate" and against "critical infrastructure" as temperatures become colder.
Energy officials said Russia was "launching a major assault" and maintenance teams were striving to fix the damage.
A barrage of missiles damaged power facilities and residential structures in Kyiv.
Several of the people injured in the assaults on the capital have been transported for medical care, as confirmed by local officials.
Area administrators said the urban area came under significant strikes overnight. A seven-year-old child was killed and three other people were injured.
The assaults follow nights of aerial attacks in the region, parts of which are occupied by Moscow's military.
All of Ukraine is in a state of readiness for hypersonic Kinzhal missile strikes, which are more difficult to spot.
Authorities told reporters that Russia was deliberately attempting to damage the national power system, with assaults already disrupting energy systems.
He said technical personnel and officials were anticipating more assaults.
