Jan. 14 (UPI) -- Ukrainian air defenses were in action around Kyiv on Wednesday morning as Russian forces launched another mass drone attack targeting the city's already ravaged power and heating infrastructure with multiple explosions heard downtown.

Mayor Vitali Klitschko said that following the raid -- the third major attack in five days -- 6,000 buildings, about half of all buildings, were without power amid freezing temperatures.

Deputy Energy Minister Mykola Kolisnyk said Tuesday that Russia was "going all in" to take out Ukraine's energy infrastructure after mass attacks targeting power and gas facilities overnight Monday and Jan. 9.

The state-run electricity network operator Ukrenergo said earlier that 70% of Kyiv had no electricity following Monday's attack.

Related