Leaders from the world have wrapped up their first day of meetings at the G20 summit in the western Japanese city of Osaka.
Despite expressing concern over trade tensions, leaders appeared jovial during an initial meet-and-greet. But Japanese officials say many are worried about the risk to the global economy posed by ongoing disputes.
Japanese Prime Minister Shinzo Abe opened the summit's first session by stressing the importance of free and open trade.
Abe said, "Anxiety and discontent brought about by globalization can sometimes create the possibility of protectionism. This can lead to sharp divisions among countries. But trade restriction does not profit any nation."
The tit-for-tat tariff dispute between the United States and China has already been a contentious issue.
And many leaders worry about the spillover effect it may have on other economies.