Some leaders from the Group of 20 major economies have expressed fears about the potential negative impact of a U.S.-China trade war on the world economy at a session of their two-day summit that started on Friday, a Japanese government official said.But it remains to be seen whether the G-20 can agree on a joint communique, as the United States and China, the world's two largest economies, have been engaged in tit-for-tat rounds of punitive tariffs on hundreds of billions of dollars of each other's imports.At the Asia-Pacific Economic Cooperation summit earlier this month, leaders of the 2…READ FULL ARTICLE