Trade barriers

Russian Economy Minister Maxim Oreshkin speaks to French executives at the headquarters of France's powerful business lobby Medef, Tuesday Aug. 29, 2017 in Paris. Oreshkin, a rising star in Vladimir Putin's government, is pushing for increased trade and investment despite protracted EU and US sanctions. (AP Photo/Christophe Ena)

Russian Economy Minister Maxim Oreshkin speaks to French executives at the headquarters of France's powerful business lobby Medef, Tuesday Aug. 29, 2017 in Paris. Oreshkin, a rising star in Vladimir Putin's government, is pushing for increased trade and investment despite protracted EU and US sanctions. (AP Photo/Christophe Ena)

FILE - In this April 29, 2017, file photo, Steve Bannon, chief White House strategist to President Donald Trump is seen in Harrisburg, Pa. Bannon says there’s no military solution to North Korea’s threats and says the U.S. is losing the economic race against China. (AP Photo/Carolyn Kaster, File)

FILE - In this July 8, 2017, file photo, U.S. President Donald Trump, left, and China's President Xi Jinping arrive for a meeting on the sidelines of the G-20 Summit in Hamburg, Germany. Trump is planning to sign an executive action asking the U.S. Trade Representative to consider investigating China for the theft of U.S. technology and intellectual property. He is taking the step even as he seeks China’s help with the ongoing crisis with North Korea. (Saul Loeb/Pool Photo via AP, File)

FILE - In this June 6, 2015, file photo, heavy machines move imported iron ore at the dock in Rizhao in eastern China's Shandong province. China announced Monday, Aug. 14, 2017, it will cut off imports of North Korean coal, iron ore and other goods in three weeks under U.N. sanctions imposed over the North’s nuclear and missile programs.(Chinatopix via AP, File)

FILE - In this June 6, 2015, file photo, heavy machines move imported iron ore at the dock in Rizhao in eastern China's Shandong province. China announced Monday, Aug. 14, 2017, it will cut off imports of North Korean coal, iron ore and other goods in three weeks under U.N. sanctions imposed over the North’s nuclear and missile programs.(Chinatopix via AP, File)

Constitutional Assembly delegate Carmen Melendez speaks from the podium during a session in Caracas, Venezuela, Tuesday, Aug. 8, 2017. The government-backed assembly that is recasting Venezuela's political system filed into the stately domed chamber where congress normally meets. In two previous sessions, the 545-member assembly met in an adjacent, smaller building. (AP Photo/Ariana Cubillos)

North Korean Foreign Minister Ri Yong-ho, left, walks toward an escalator during ongoing meetings at the Philippine International Convention Center for the 50th ASEAN Foreign Ministers' Meeting and Related Meetings in Manila, Philippines, Monday, Aug. 7, 2017. (Rolex Dela Pena/Pool Photo via AP)

Visitors watch the North side from the unification observatory in Paju, South Korea, Sunday, Aug. 6, 2017. The U.N. Security Council unanimously approved tough new sanctions Saturday to punish North Korea for its escalating nuclear and missile programs including a ban on coal and other exports worth over $1 billion - a huge bite in its total exports, valued at $3 billion last year.(AP Photo/Lee Jin-man)