LONDON—Global equity markets made a cautious start on Monday amid talk of more sanctions against Russia over its invasion of Ukraine, while a closely watched part of the U.S. yield curve fuelled recession worries further. Germany said the West would agree to impose more sanctions on Russia in the coming days after Ukraine accused Russian forces of war crimes following civilian deaths near Kyiv. More sanctions would ratchet up the already vast economic pressure on Russia following the conflict in Ukraine. “I think that’s the key driver over the near term what happens with the sanctions if they peak here or not,” said Mark Haefele, chief investment officer at UBS Global Wealth Management. The pan-European STOXX 600 was flat an hour and a half after the open while S&P 500 and Nasdaq stock futures were down about 0.1 percent. Earlier, MSCI’s broadest index of Asia-Pacific shares outside Japan inched up …