Chancellor Olaf Scholz of Germany said in Beijing on Friday that he had been assured that China’s approval process for Covid-19 vaccines made by the German company BioNTech would be sped up. In turn, he said, he would push for Chinese vaccines to be granted regulatory approval by the European Union. Mr. Scholz, concluding a one-day visit with the Chinese leader, Xi Jinping, said preparations were also underway for BioNTech’s vaccine to be offered to some expatriates in China, describing this “a first step.” BioNTech has been trying for more than two years to win permission for the sale in...