Kramatorsk (Ukraine) (AFP) - Russian troops were aiming to take control of the city of Mariupol on Tuesday, part of an anticipated massive onslaught across eastern Ukraine, as defending forces tried desperately to hold them back.
Russia is believed to be trying to connect occupied Crimea with Moscow-backed separatist territories Donetsk and Lugansk in Donbas, and has laid siege to the strategically located city, once home to more than 400,000 people.
"It is likely that in the future the enemy will try to take control of the city of Mariupol, capture Popasna and launch an offensive in the direction of Kurakhove in order to reach the administrative borders of Donetsk region," the General Staff of the Armed Forces of Ukraine said on Facebook.
In Mariupol itself, Ukrainian forces were "surrounded and blocked", according to Myhaylo Podolyak, an official from President Volodymyr Zelensky's office.
But on Monday the army insisted that "the defence of Mariupol continues".
"The connection with the units of the defence forces that heroically hold the city is stable and maintained," the Land Forces of Ukraine wrote on Telegram.
In his nightly address, Zelensky made another plea to his allies for more weapons to boost the defence of the city.
"We are not getting as much as we need to end this war sooner.To completely destroy the enemy on our land...in particular, to unblock Mariupol," he said.
He made a similar appeal for military assistance to South Korea's National Assembly earlier in the day, telling lawmakers Russia had "completely destroyed Mariupol and burned it to ashes".
"At least tens of thousands of Mariupol citizens must have been killed," he added.
Chemical weapons allegations
Late Monday, Britain said it was trying to verify reports that Russia had also used chemical weapons in the city.
Western officials have previously expressed concerns that as the conflict drags into its seventh week, Russia could resort to such extreme measures.
Ukrainian lawmaker Ivanna Klympush said Russia had used an "unknown substance" and that people were suffering from respiratory failure.
But on messaging app Telegram, Petro Andryushchenko, an aide to the city's mayor, wrote that a chemical attack was not confirmed and that they were "waiting for official information from the military".
Elsewhere in the east, heavy bombardment continued as civilians were urged to flee ahead of an expected Russian troop surge in the region.
Eight people were killed by shelling in the northeastern city of Kharkiv, the head of the regional state administration Oleg Synegubov said.
Russian forces are reinforcing around the Donbas region, notably near the town of Izyum, but have not yet launched a full offensive, Pentagon officials said Monday.
They reported a Russian convoy had been observed heading for Izyum, an hour's drive north of Kramatorsk, saying it appeared to be a mix of personnel-carriers, armoured vehicles and possible artillery.
Ukraine's defence ministry said it believed a major assault would happen soon.
"We don't know precisely when, but the preparation is almost over," spokesman Oleksandr Motuzyanyk told a briefing on Monday.
- 'Logic of war' -
Such signs of a build-up in Donbas suggest hopes of an imminent diplomatic solution remain slim.
After a meeting with Russian President Vladimir Putin on Monday, Austrian Chancellor Karl Nehammer said he was "rather pessimistic" of such efforts succeeding as Putin had "massively entered into a logic of war".
Ukraine's allies are trying instead to increase economic and diplomatic pressure on Moscow -- but EU foreign ministers' discussions on a sixth round of sanctions on Monday ended without a consensus.
"Nothing is off the table, including sanctions on oil and gas," Josep Borrell, the European Union's top diplomat, told reporters after the meeting."But today, no decision was taken."
In an effort to shore up wider international support for Kyiv, US President Joe Biden held virtual talks with Indian Prime Minister Narendra Modi just weeks after saying New Delhi had been "shaky" in its response to the invasion.
And the UN Security Council -- which on Monday held a session on the plight of women and children in Ukraine -- will hold another meeting next week on the humanitarian situation there, in a bid to keep pressure on Russia despite its veto power over the body, diplomats said.
'Rape and sexual violence'
At Monday's UNSC meeting, officials called for an investigation into violence against women during the conflict.
"This war must stop.Now," Sima Bahous, director of the UN women's agency, told the Council.
"We are increasingly hearing of rape and sexual violence.These allegations must be independently investigated to ensure justice and accountability."
More than 4.5 million Ukrainian refugees have now fled their country, the United Nations refugee agency said -- 90 percent of them women and children.
The war has displaced more than 10 million people overall.
One of those was Tatyana Kaftan, just weeks away from giving birth to her first child, who spoke to AFP at an aid distribution point in the western city of Lviv.
Her husband, who is waiting to be called up to the army, stood by her side.
"We left everything at home," said the 35-year-old travel agent, who drove with her husband all the way from Mykolaiv to escape Russian shelling.
"We have nothing."
'No words'
Russian troops have been accused of widespread atrocities across the country, particularly in areas around Kyiv from which they have now withdrawn, allegations Moscow categorically denies.
Ukraine says more than 1,200 bodies have been found around the capital.
Seven bodies were found Monday under the rubble of two multi-storey buildings in the town of Borodianka, the state emergency service said, bringing the total to 19.
Lithuania's prime minister, who was touring the town, said she had "no words" to describe the devastation and accused Russia of war crimes.
"The images of the ruined Ukrainian towns and cities, and the testimonies of the survivors, reveal the real face of Russia," Ingrida Simonyte said.
French investigators have arrived in Ukraine to help probe suspected war crimes, and the European Union has earmarked 2.5 million euros ($2.7 million) to the International Criminal Court for future Ukraine cases.
The global consequences of the war were evident Monday as the World Trade Organization projected world trade growth could almost halve this year.
The WTO said the conflict was a "severe blow" to the world's economy which in the longer term could even spark a disintegration of the global economy into separate blocs.
Russia was also blamed for an escalating global food crisis by the EU's Borrell, because of its bombing of wheat stocks and preventing ships from carrying grain abroad.
