Ukrainian authorities issued new air raid alerts across the country on Tuesday as Russian bombers took to the skies, a day after Moscow carried out a 'massive' attack on Ukraine's power grid, reports BSS.

Russia fired hundreds of drones and missiles at Ukraine on Monday, killing at least four people and battering the country's already weakened energy grid, officials said.

Ukraine's air force confirmed early Tuesday the "takeoff of several Tu-95MS from the Engels airfield" in western Russia, prompting air raid alerts across the country.

Two more people were killed overnight in the central Ukrainian city of Kryvyi Rig, according to a local official, in strikes that also damaged homes and businesses.

On Monday, President Volodymyr Zelensky said Moscow launched at least 127 missiles and 109 drones in "one of the largest Russian attacks".

Of those, 102 missiles and 99 drones were shot down, according to Ukrainian Air Force Commander Mykola Oleshchuk, who described it as Russia's "most massive" attack.

The United States and Britain both condemned the assault, with US President Joe Biden calling it "outrageous" and British Foreign Secretary David Lammy branding it "cowardly".

Germany's foreign ministry said that "once again, Putin's Russia is saturating Ukraine's lifelines with missiles".

Bd-pratidin English/Tanvir Raihan