Kyiv and Moscow are set to sign a deal Friday in Istanbul to unblock grain exports and relieve a global food crisis, even as Russian forces launch deadly artillery barrages over east Ukraine.
The first major accord between the warring sides -- brokered with the UN and Turkey -- was expected while Russian forces battered Ukraine's southern coast and left several dead in the industrial Donbas.
President Recep Tayyip Erdogan's spokesman Ibrahim Kalin announced the accord would be signed at the lavish Dolmabahce Palace on the Bosphorus Strait with UN Secretary-General Antonio Guterres and the Turkish leader.
But the news drew scepticism from Ukrainian farmers under pressure in the war-battered south to shift stores from rapidly-filling silos and with local prices tanking.
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"It gives some hope but you can't believe what the Russians say," said Mykola Zaverukha, a farmer with some 13,000 tonnes of grain waiting for export.
"Russia is unreliable, they have shown themselves to be year after year," he told AFP in the southern Mykolaiv region.
Despite hopes for a breakthrough, Russian forces pursued a relentless shelling campaign in the eastern Donetsk region, which has been the focus of Russia's campaign in recent months.
"Five killed and 10 wounded in the region in the last 24 hours," the Ukrainian presidency announced Friday.
In the Donetsk village of Chasiv Yar, which was hit by a strike on July 10 which killed more than 45 people, a 64-year-old woman gathered apricots near the wreckage.
"There is nothing anymore. The officials have left. We have to fend for ourselves to stay alive," said Lyudmila, who only gave her first name.
In the south, Ukraine said Russian forces were shelling villages along the frontline in the Kherson area, where Kyiv's army is trying to claw back Moscow-occupied territory.
The five-month war is being fought across one of Europe's most fertile regions by two of the world's biggest grain producers.
Up to 25 million tonnes of wheat and other grain have been blocked in Ukrainian ports by Russian warships and landmines Kyiv has laid to avert a feared amphibious assault.
Ukrainian foreign ministry spokesman Oleg Nikolenko told AFP late Thursday that Kyiv would only accept solutions that guarantee the security of its southern regions, the position of its forces in the Black Sea and the safe export of agricultural products.
Under the terms of the elusive accord, Ukraine would export grain through the Black Sea ports of Odessa, Pivdennyi and Chornomorsk, with the hope of expanding the offering over time, a Ukrainian lawmaker Rustem Umerov told reporters Thursday.
The United States welcomed the deal but urged Russia to implement it in good faith.
"We should never have been in this position in the first place," said State Department spokesman Ned Price, accusing Russia of "weaponising" food.
The parties were convening in Istanbul one day after Russia's restart of the Nord Stream gas pipeline eased concerns in Europe of a permanent shut off after 10 days of repairs.
Yet even the resumption of 40 percent of supplies would be insufficient to ward off energy shortages in Europe this winter, experts warned.
Russian troops invaded Ukraine on February 24 and the war has left thousands dead and forced millions to flee their homes but the military toll on both sides has remained speculative at best.
Some 15,000 Russians have died in the invasion, US and British spy chiefs said, as they assessed that President Vladimir Putin was suffering far greater losses than expected.
Britain became the latest country Thursday to announce it is re-upping military supplies with Ukraine artillery, "hundreds of drones and hundreds more anti-tank weapons" for Ukraine in the coming weeks.
But Russia has warned about Western arms deliveries and said they mean Moscow's military aims are expanding beyond the eastern war-battered Donbas.