Russia battered Ukraine with multiple missile strikes on Thursday as its troops sought to advance in the east, Kyiv said, while Western allies pledged to keep military aid flowing for an intended Ukrainian spring counter-offensive.
Following a pattern of heavy bombardments at times of Ukrainian battlefield or diplomatic advances, Russia launched 32 missiles in the early hours, Ukraine's Air Force said.
Half were shot down, it added, a rate lower than normal.
Among them, air defences in the south downed eight Kalibr missiles fired from a ship in the Black Sea, Ukrainian officials said. Other missiles struck northern and western Ukraine as well as the central regions of Dnipropetrovsk and Kirovohrad.
Russia has usually carried out its heaviest strikes in daylight, targeting energy facilities. But Ukrainian officials said the overnight bombardment had no major impact on power.
They believe Moscow is adapting its strategy, including using air balloons for reconnaissance.
"The Russians have changed their tactics somewhat. They conduct active reconnaissance, use false targets," Andriy Yermak, head of the Ukrainian presidential staff, wrote on the Telegram messaging app.
Ukraine did not say why fewer missiles had been knocked out than usual but it has previously reported lower success rates when Russia fired Soviet-era Kh-22 missiles.
Bolstered by tens of thousands of reservists, Russia has intensified ground attacks across southern and eastern Ukraine in recent weeks, and a major new offensive appears to be shaping as the first anniversary of its February 24 invasion nears.
The conflict has killed tens of thousands of people, pulverised Ukrainian cities, destabilised the global economy just as it was recovering from the Covid-19 pandemic, and uprooted millions of people from their homes.
Showing the scale of the humanitarian disaster, Germany said 1.1 million people arrived from Ukraine in 2022, exceeding an unprecedented migrant influx in 2015-16.
Russia did not immediately comment on the overnight bombardment, though on Wednesday it was touting Ukrainian retreats in parts of the eastern province of Luhansk.
Battle for Bakhmut
Luhansk and Donetsk provinces make up the Donbas, Ukraine's industrial heartland, which is now partially occupied by Russia. It wants full control of the Donbas and its current focus is on encircling and taking the small city of Bakhmut in Donetsk.
Bakhmut's capture would give Russia a stepping stone to advance on two bigger cities, Kramatorsk and Sloviansk further west in Donetsk, to revive Moscow's momentum ahead of the February 24 anniversary. Ukraine and its allies say taking Bakhmut would be a pyrrhic victory given the months it has taken and what they claim is an enormous loss of life during waves of Russian assaults.
As Ukraine burns through munitions fast and clamours for heavier firepower, including tanks and fighter jets, NATO alliance nations are ramping up production and promising more.
President Volodymyr Zelenskiy's army has received vast amounts of aid, particularly from the United States which has committed more than $27.4 billion since the conflict began.
Senior US officials have advised Ukraine to hold off with a major counter-offensive until the latest supply of US weaponry is in place and training has been provided.
"We have to ensure that this spring it is truly felt that Ukraine is moving towards victory," Zelenskiy said.
He thanked Norway for pledging $7 billion over five years, its largest aid programme ever for a single recipient nation.
Russia calls the invasion a "special military operation" against security threats and has cast deliveries of heavy weapons to Ukraine as proof that the West is escalating the war.
Kyiv and its allies call Russia's actions a land grab.
In the latest of a stream of foreign dignitaries to visit Ukraine, Israeli Foreign Minister Eli Cohen was set to meet Zelenskiy. It was the first such visit from a senior Israeli official since the war began.
Israel, which coordinates with Russia over strikes on suspected Iranian targets in Syria, has stopped short of pledging any direct weapons supplies to Kyiv.
Belarus, which allowed Russia to use its territory to send troops into Ukraine at the start of the war, said it would only fight alongside its ally if it was attacked.
Its President Alexander Lukashenko has repeatedly denied suggestions from Kyiv that it could join in the conflict.