President Volodymyr Zelensky has said Ukraine would reject any Russian proposal to give up the Donbas region in exchange for a ceasefire, warning it could be used as a springboard for future attacks.Zelensky was speaking ahead of a meeting between US President Donald Trump and Russian counterpart Vladimir Putin in Alaska on Friday.Trump has insisted any peace deal would involve “some swapping of territories” and could see Russia taking the entire eastern Donbas region and keeping Crimea. Meanwhile Moscow’s troops have continued their summer offensive, making a sudden thrust near the eastern Ukrainian town of Dobropillia and advancing 10km (six miles) in a short period of time. Zelensky admitted the advance had taken place in “several spots” but said Kyiv would soon destroy the units involved in the attack.No official details have emerged on what demands Vladimir Putin could make when he meets Donald Trump in Anchorage on Friday. The Donbas – made up of the eastern regions of Luhansk and Donetsk – has been partly occupied by Russia since 2014.Moscow now holds almost all of Luhansk and about 70% of Donetsk but speaking to reporters on Tuesday, Zelensky reaffirmed that Ukraine would reject any proposal to leave the Donbas. “If we withdraw from the Donbas today – our fortifications, our terrain, the heights we control – we will clearly open a bridgehead for the Russians to prepare an offensive,” he said.In his nightly address on Tuesday, Zelensky also said Moscow was preparing new offensives on three parts of the front – Zaporizhzhia, Pokrovsk and Novopavlov areas. Last week Tru …