American chief executives attended President Trump’s state dinner with Xi Jinping, while prominent Chinese business leaders were absent, underscoring how sharply U.S.-China commercial ties have deteriorated. During Xi’s 2015 state visit, Alibaba’s Jack Ma and Tencent’s Pony Ma were among Chinese technology executives who traveled with him to meet American counterparts. Despite disputes over human rights, cyberattacks and trade, both countries then saw significant opportunities in each other’s markets. Emily Kilcrease, a senior fellow and director at the Center for a New American Security, said the absence was a depressing measure of the relationship’s decline and that the summit had been expected to produce commercial deals.