BEIJING—European stocks and Wall Street futures rebounded Wednesday as investors watched diplomatic efforts to end Russia’s attack on Ukraine, while Asian markets sank after Chinese inflation accelerated. Already high oil prices added more than $1 per barrel following President Joe Biden’s ban on imports of Russian crude. London and Frankfurt opened higher. Shanghai, Tokyo, and Hong Kong declined amid enduring unease about the war’s global impact. Futures for Wall Street’s S&P 500 index and Dow Jones Industrial Average were up 1 percent after the market slid Tuesday. “Financial markets seem calmer” as Ukrainian and Russian diplomats prepare to meet in Turkey, Chris Turner, and Francesco Pesole of ING said in a report. “Yet energy prices look set to stay high as the West weans itself off Russian exports.” In early trading, the FTSE 100 in London jumped 2.1 percent to 7,107.28. Frankfurt’s DAX surged 3.7 percent to 13,302.51 and CAC …