The Asia-Pacific Economic Cooperation group said Friday that it was "concerned" over the challenges to global trade, as ministers from APEC countries met in South Korea in the shadow of growing woes from U.S. tariffs. Trade ministers from the top economies that make up APEC are meeting on South Korea's Jeju Island amid concerns for the global trading system since U.S. President Donald Trump unveiled bombshell levies on most partners. The United States is a key APEC member and was represented by Trade Representative Jamieson Greer, who held a series of bilateral meetings with nations eager to soften the blow of Washington's tariffs. "We are concerned with the fundamental challenges faced by the global trading system," trade ministers from the 21-member group said in a joint statement. They urged greater cooperation, saying they "remain committed" to APEC as a means of "bringing us together to address the economic challenges facing our region". South Korea's Minister for Trade, Cheong In-Kyo, said the joint statement was hard-won, with "significant differences" in positions clear early on in the talks. But at the last minute, the countries "dramatically" reached an agreement, he said, with the APEC emphasizing the importance of global trading mechanisms such as the World Trade Organization (WTO), as well as sustainable supply chains. This "sends a highly positive signal to global markets", he said, adding that "APEC members can work together to navigate the current highly uncertain global trade environment effectively". Cheong said there had been no discussion of "joint responses" to U.S. tariffs, saying it was not possible as "each country faces significantly different circumstances". South Korea recorded a $66 billion trade surplus with the United States last year -- behind only Vietnam, Taiwan, and Japan -- making it a key target of Trump's trade tirade. Highly dependent on exports, the country has been hit hard by the 25 percent tariffs on automobiles imposed by Trump in early April. The auto industry accounts for 27 percent of South Korea's exports to the United States, which takes in nearly half of the country's car exports. Trump announced additional "reciprocal" tariffs of up to 25 percent on South Korean exports last month, but later suspended them until early July. Seoul aims to leverage the talks with commitments to purchase more U.S. liquefied natural gas (LNG) and offer support in shipbuilding, a sector in which South Korea is a leader, after China. Earlier Friday, Greer met Chung Ki-sun, the vice chairman of HD Hyundai, which owns South Korea's country's largest shipbuilding company. HD Hyundai said in a statement that discussions covered cooperation with US ship maker Huntington Ingalls Industries. Greer is also set to meet the CEO of South Korean shipbuilder Hanwha Ocean, which provides maintenance, repair and overhaul services for U.S. Navy vessels. Shares of Hanwha Ocean rose nearly three percent on Friday morning, while HD Hyundai Heavy Industries gained as much as 3.6 percent.