Lviv, Ukraine — Afrom a besieged city in southern Ukraine collapsed Sunday as Russian attacks stopped plans to create a humanitarian corridor, a Ukrainian government official said, and Pope Francis called for an end to the "rivers of blood and tears" created by the war.
Food, water, medicine and almost all other supplies were in desperately short supply in the port city of Mariupol, where Russian and Ukrainian forces had agreed to a 11-hour cease-fire to allow civilians and the wounded to be evacuated. But Russian attacks quickly closed the corridor, Ukrainian officials said.
"There can be no 'green corridors' because only the sick brain of the Russians decides when to start shooting and at whom," Interior Ministry adviser Anton Gerashchenko said on Telegram.
The news dashed hopes that more people could escape the fighting in Ukraine, where Russia's plan to quickly overrun the country has been stymied by fierce resistance. Russia has made significant advances in southern Ukraine and along the coast, but many of its efforts have become stalled, including an immense military convoy that has been almost motionless for days north of Kyiv.
The war, now in its 11th day, has caused 1.5 million people to flee the country. The head of the U.N. refugee agency called the exodus "the fastest-growing refugee crisis in Europe since World War II."
As he has often done, Russian President Vladimir Putin turned blame for the fighting back on Ukraine, telling Turkish President Recep Tayyip Erdogan on Sunday that the invasion could be halted only "only if Kyiv ceases hostilities," according to a Kremlin statement on the phone call.
He said Ukraine had to fulfill "the well-known demands of Russia," which include what he calls the "demilitarization" and "denazification" of Ukraine.
The presidents of Turkey and France, as well as Pope Francis, appealed to Putin to negotiate.
In a highly unusual move, the pope said he had dispatched two cardinals to Ukraine, saying the Vatican would do everything it could to end the conflict.
"In Ukraine, rivers of blood and tears are flowing," the pontiff said in his traditional Sunday blessing. "This is not just a military operation, but a war that sows death, destruction and misery."
After the cease-fire in Mariupol failed to hold Saturday, Russian forces intensified their shelling of the city and dropped massive bombs on residential areas of Chernihiv, a city north of Kyiv, Ukrainian officials said.
British military officials compared Russia's tactics to those Moscow used in Chechnya and Syria, where surrounded cities were pulverized by airstrikes and artillery.
"This is likely to represent an effort to break Ukrainian morale," the U.K. Ministry of Defense said.
Ukrainian President Volodymyr Zelensky reiterated a request for foreign protectors to impose a no-fly zone over Ukraine. Putin warned Saturday that Moscow would consider a third-party declaration to close Ukrainian airspace to be a hostile act, and the West so far has rebuffed Zelensky's pleas, fearing a confrontation with Russia.
"The world is strong enough to close our skies," Zelensky said in a video address on Sunday.
Oleksiy Arestovich, an adviser to Zelensky, said Ukrainian officials and international humanitarian organizations were working with Russia through intermediaries to establish humanitarian corridors from Bucha and Hostomel, which are Kyiv suburbs where there has been heavy fighting.
As Russian forces surrounded several Ukrainian cities, Zelensky appeared on television Saturday night and rallied his people to stay defiant.
"Ukrainians in all of our cities that the enemy has entered — go on the offensive!" said Zelensky, who was wearing his habitual military green T-shirt. "You should take to the streets! You should fight! … It is necessary to go out and drive this evil out of our cities, from our land."
The strength of Ukrainian resistance continues to surprise Russian forces, and they have responded by targeting populated areas, including the cities of Kharkiv, Chernihiv and Mariupol, the U.K. Ministry of Defense said in its daily intelligence briefing.
The death toll is difficult to measure. The U.N. human rights office said at least 351 civilians have been confirmed killed, but the true number is probably much higher.
Ukraine's military is vastly outmatched by Russia's, but its professional and volunteer forces have fought back with fierce tenacity. In Kyiv, volunteers lined up Saturday to join the military.
Even in cities that have fallen, there were signs of the resistance Zelensky requested.
Onlookers in Chernihiv cheered as they watched a Russian military plane fall from the sky and crash, according to video released by the Ukrainian government. In Kherson, hundreds of protesters waved blue and yellow Ukrainian flags and shouted, "Go home."
But the struggle to enforce temporary ceasefires in Mariupol and Volnovakha on Saturday showed the fragility of efforts to stop the fighting across Ukraine.
A third round of talks between Russia and Ukraine will take place Monday, according to Davyd Arakhamia, a member of the Ukrainian delegation. He gave no additional details, including where they would take place. Previous meetings were held in Belarus. Those talks led to the cease-fire agreement that failed Saturday and was revived Sunday.
Russia has made significant advances in southern Ukraine as it seeks to block access to the Sea of Avrov. Capturing Mariupol could allow Moscow to establish a land corridor to Crimea, which Russia annexed from Ukraine in 2014 in a move that most other countries considered illegal.
Meanwhile, the head of the Chernihiv region said Russia has dropped powerful bombs on residential areas of the city of the same name, which has a population of 290,000. Vyacheslav Chaus posted a photo online of what he said was an undetonated FAB-500, a 1,100-pound bomb.
"Usually this weapon is used against military-industrial facilities and fortified structures," Chaus said.
Zelensky sought to rally supporton Saturday, speaking to more than 300 members of Congress via a video link. He pleaded for additional help, specifically fighter planes to help secure the skies over Ukraine, even as he insisted Russia was being defeated.
Russian troops were advancing on a third, Zelensky said. They have already taken control of the Zaporizhzhia plant in Ukraine, as well as Chernobyl, the site of the world's worst nuclear disaster.
President Biden called Zelensky early Sunday, Kyiv time, to discuss Russia sanctions and speeding U.S. assistance to Ukraine. The White House said the conversation also covered talks between Russia and Ukraine but did not give details.
Blinken on Sunday was in Moldova, where he pledged support for the western-leaning former Soviet republic that is coping with an influx of refugees and warily watching Russia's moves in Ukraine.
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