(Reuters) - President Volodymyr Zelenskiy has urged the West to give Ukraine tanks, planes, and missiles to fend off Russian forces as his government said Moscow's forces were targeting the country's fuel and food depots.
U.S. President Joe Biden's three-day tour of Europe ended with comments suggesting Washington was taking a much sharper line on Russia when he said on Saturday Russian President Vladimir Putin "cannot remain in power".
Biden's improvised remarks during a speech in Warsaw were not a call for regime change in Russia but meant Putin should not be allowed to exercise power over his neighbors or the region, a White House official said afterward.
Moscow dismissed Biden's comments, saying it was not up to the U.S. president to decide who governed Russia.
The Russian invasion has devastated several Ukrainian cities, caused a humanitarian crisis, and forced millions to flee their homes.
In a late-night television address on Saturday, Zelenskiy demanded that Western nations hand over military hardware that was "gathering dust" in stockpiles, saying his nation needed just 1% of NATO's aircraft and 1% of its tanks.
Western nations have so far given Ukraine anti-tank and anti-aircraft missiles as well as small arms and protective equipment, but have not offered any heavy armor or planes.
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"We've already been waiting 31 days. Who is in charge of the Euro-Atlantic community? Is it really still Moscow, because of intimidation?" Zelenskiy said, suggesting Western leaders were holding back on supplies because they were frightened of Russia.
Ukrainian Interior Ministry adviser Vadym Denysenko said on Sunday that Russia had started destroying Ukrainian fuel and food storage centers, meaning the government would have to disperse stocks of both in the near future.
Appearing to confirm that, the Russian defense ministry said its missiles had wrecked on Saturday a fuel deposit as well as a military repair plant near the western city of Lviv, just 60 km (40 miles) from the Polish border.
Local officials said four missiles had hit the city, sending plumes of black smoke into the sky, in a rare strike on the west of Ukraine with much of the fighting since the Feb. 24 Russian invasion so far focused on southern and eastern regions and near the capital Kyiv in the north.
Biden drew criticism for his remarks at the end of a speech that sought to frame the war as part of a historic struggle for democratic freedoms.
"For God's sake, this man cannot remain in power," said Biden, who earlier in the day called Putin a "butcher".
Veteran U.S. diplomat Richard Haass, president of American think-tank the Council on Foreign Relations, said on Twitter (NYSE:TWTR) the comments made "a dangerous situation more dangerous".
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"I suggest his chief aides reach their counterparts & make clear US (is) prepared to deal with this Russian (government)," he wrote.
Moscow says the goals for what Putin calls a "special military operation" include demilitarising and "denazifying" its neighbor. Ukraine and its Western allies call this a pretext for an unprovoked invasion.
Russia has failed to seize any major Ukrainian city since its troops started pouring into the country on Feb. 24.
In its latest military assessment, the British Ministry of Defence said Russian forces appeared to be concentrating their efforts to attempt the encirclement of Ukrainian forces directly facing separatist regions in the east of the country.
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"The battlefield across northern Ukraine remains largely static with local Ukrainian counterattacks hampering Russian attempts to reorganize their forces," the ministry said.
The General Staff of Ukraine’s Armed Forces said on Sunday that Russia continued with its "full-scale armed aggression", while Ukrainian forces had repulsed seven attacks in the eastern regions of Donetsk and Luhansk.
The Interior Ministry adviser Denysenko said Russia was bringing forces to the border on rotation and could make fresh attempts to advance in its invasion.
Moscow has repeatedly said its operations are going to plan, but Western leaders say the assault has largely stalled in the face of fierce resistance.
Reuters could not independently verify the accounts of fighting throughout Ukraine.
Ukraine and Russia have agreed to two "humanitarian corridors" to evacuate civilians from frontline areas on Sunday, including allowing people to leave by private car from the southern city of Mariupol, Deputy Prime Minister Iryna Vereshchuk said.
The encircled port, which lies between Russian-annexed Crimea and eastern areas held by Russian-backed separatists, has been devastated by weeks of heavy bombardment, forcing thousands of residents to take shelter in basements with scarce water, food, medicine, or power.
The U.N. has confirmed 1,104 civilian deaths and 1,754 injuries across Ukraine but says the real toll is likely to be higher. Ukraine said on Sunday that 139 children have been killed and more than 205 wounded.