Ukrainian officials are holding high-level talks with the incoming Trump administration, seeking to narrow wide differences on achieving a settlement of Kyiv’s war with Russia even before President-elect Donald Trump takes office. A top aide to Ukrainian President Volodymyr Zelensky is due to meet Wednesday with Keith Kellogg, Trump’s choice as special envoy for Russia and Ukraine, and Mike Waltz, the incoming national security adviser, according to a Trump transition official and several people familiar with the discussions. Kellogg has signaled support for the Biden administration’s efforts to rush weapons to Ukraine, saying it will give Trump leverage with Moscow...