Russia's defense minister said Wednesday that Moscow's troops were retreating from the key southern Ukraine city of Kherson, although Ukrainian officials expressed skepticism that a full withdrawal was underway from the lone regional capital Russia had captured since its invasion last February.Although such a withdrawal would be a major setback for Russian President Vladimir Putin, President Joe Biden would not say Wednesday whether this would prompt Kyiv to negotiate with Moscow."The enemy does not give us gifts, does not make 'goodwill gestures', we win it all," Ukrainian President Volodymyr Zelenskyy said in his daily address to the nation, adding any gains by Ukraine come at the expense of "lives lost by our heroes."Biden said on Wednesday that he expected U.S. aid to Ukraine to continue despite a warning last month from Republican House leader Kevin McCarthy that a Republican-controlled House of Representatives would not would not write a "blank check" to the besieged nation."So I would be surprised if Leader McCarthy even has a majority of his Republican colleagues who say they're not going to fund the legitimate defensive needs of Ukraine.""