At least six people have been killed after Russia launched a massive attack across Ukraine on Monday.
Ukrainian President Volodymyr Zelensky says more than 100 missiles and about 100 attack drones were launched, BBC reports.
Russia claims it used high-precision weapons to hit energy infrastructure - with power and water outages reported in many Ukrainian cities.
The wave of attacks come three weeks after Ukraine's incursion into Russia's Kursk region - Moscow has vowed to retaliate.
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