Rescuer rests at a site damaged during a Russian missile strike, in Kyiv
A rescuer rests at a site of a residential house damaged during a Russian missile strike, amid Russia's attack on Ukraine, in Kyiv, Ukraine December 29, 2022. Reuters

After a day when his entire country was attacked by Russian missiles, Ukrainian President Volodymyr Zelenskiy acknowledged that most regions were suffering power outages but he said the damage would have been worse without "heroic" air defence.

Zelenskiy, in a video address on Thursday night, said air commands in central, southern, eastern and western Ukraine repelled 54 Russian missiles and 11 drones during one of Russia's biggest aerial assaults since it started the war in February.

The areas where loss of power was "especially difficult" included the capital Kyiv, Odesa and Kherson in the south and surrounding regions, and the region around Lviv near the western border with Poland, Zelenskiy said.

"But this is nothing compared with what could have happened if it were not for our heroic anti-aircraft troops and air defence," he said.

Air raid sirens rang out across Ukraine - for five hours in Kyiv. Reuters footage showed emergency workers pouring through the smouldering wreckage of residential homes in Kyiv destroyed by a blast and smoke trails of missiles in the sky. Officials had earlier said more than 120 missiles were fired during Thursday's assault.

More than 18 residential buildings and 10 critical infrastructure installations were destroyed in the latest attacks, the defence ministry said in a statement.

Waves of Russian air strikes in recent months targeting energy infrastructure have left millions without power and heating in often freezing temperatures.

BATTLEFIELDS

Ukraine's smaller armed forces have scored several battlefield victories against the invading Russian troops but for months Zelenskiy has asked Western countries for additional help with air defence. To that end, the United States last week announced nearly $2 billion in more military aid, including the Patriot Air Defense System, which offers protection against aircraft, cruise and ballistic missiles.

Moscow has repeatedly denied targeting civilians, but Ukraine says its daily bombardment is destroying cities, towns, and the country's power, medical and other infrastructure.

Russia invaded Ukraine on Feb. 24 in what President Vladimir Putin calls a "special military operation" against what it perceives as threats to its security. Ukraine and its Western allies have denounced Russia's actions as an imperialist-style land grab and imposed sanctions to try to disrupt the campaign.

The most intense fighting is still in the eastern frontline towns of Bakhmut and Soledar in Donetsk province, one of four regions Russia claimed to have annexed in September. The others are Luhansk in the east, and Kherson and Zaporizhzhia in the south.

Russian forces do not fully control any of the four regions, although the Kremlin has said they are making progress in one of the main stated goals of "demilitarising" Ukraine.

Russia is looking for a battlefield victory in eastern Ukraine and has been trying to capture Bakhmut for months.

Russia "has not abandoned the insane idea of capturing the Donetsk region," Zelenskiy said on Thursday night.

Ukraine's troops have held on in Donetsk, which together with Luhansk makes up Russian-speaking Donbas, an industrial heartland and part of which was seized by Russia-backed separatists in 2014. The same year, Russia also annexed the Crimean Peninsula from Ukraine.

Missiles attack on Kyiv
Rescuers work at a site of private houses heavily damaged by a Russian missile strike, amid Russia's attack on Ukraine, in Kyiv, Ukraine, in this handout picture released December 29, 2022. Press service of the State Emergency Service of Ukraine/Handout via REUTERS. Reuters
Rescuers work at a site damaged during a Russian missile strike, in Kyiv
Rescuers work at a site of a residential house damaged during a Russian missile strike, amid Russia's attack on Ukraine, in Kyiv, Ukraine December 29, 2022. Reuters
A view of a house destroyed by a Russian missile strike in Kyiv
A view of a house destroyed by a Russian missile strike, as Russia's attack on Ukraine continues, in Kyiv, Ukraine December 29, 2022. Reuters
Ukrainian Border Guards receive donations of food and gifts, in Sloviansk
Ukrainian Border Guards receive drawings from school children, among donations of food and gifts from their families and people in general, as Russia's attack on Ukraine continues, in Sloviansk, Ukraine, December 29, 2022. Reuters
A local resident stands near her house destroyed by a Russian military strike in Kherson
Local resident Klavdia, 82, stands near her house which was destroyed by a Russian military strike, as Russia's attack on Ukraine continues, in Kherson, Ukraine December 29, 2022. Reuters