TOKYO—World shares were mixed Tuesday after talks between Russia and Ukraine aimed at ending the war just yielded an agreement to meet again. European markets opened mostly lower while Asian shares and U.S. futures were mostly higher. Oil prices rose. A 40-mile convoy of Russian tanks was threatening Ukraine’s capital Kyiv in the sixth day of the war as the Kremlin grew increasingly isolated. A first, five-hour session of talks ended with an agreement to another meeting in coming days, though embattled Ukrainian President Volodymyr Zelenskyy said he believed stepped-up shelling by Russian troops was designed to force him into concessions. Russia is a major energy producer and surging oil prices and increasing financial pressure from the U.S. and allies on Russia for its invasion of Ukraine were adding to uncertainty about the global economic outlook. France’s CAC 40 lost 0.6 percent to 6,622.35. Germany’s DAX shed 0.7 percent to …