Donald Trump’s lead negotiator has been pushing Volodymyr Zelensky to hand over the entire Donetsk region to Russia in order to end the war in Ukraine, it has emerged.Steve Witkoff, who has met with Vladimir Putin, the Russian president, five times this year, told the Ukrainian delegation visiting the White House last Friday to surrender the territory its forces control.It is one of the key demands made by Putin, who made clear in a phone call with Mr Trump last week that he still wants Ukraine to give up the stretch of land as a precondition for peace, The Washington...