By Jonathan Landay BLAHODATNE, Ukraine (Reuters) – Ukrainian troops were greeted by joyous residents in the centre of Kherson on Friday after Russia abandoned the only regional capital it had captured since its invasion in February. Russia said it had completed the pullout across the Dnipro River without losing a single soldier, but Ukrainians painted a picture of a chaotic retreat, with Russian troops ditching their uniforms or drowning while trying to escape. Video footage circulating on the internet showed dozens of Ukrainians cheering and chanting victory slogans in Kherson’s central squar…