Trump slaps steep tariffs on imported washing machines and solar panels. South Korea said it would complaint to WTO, while China branded the move an overreaction.

When US President Donald Trump withdrew the United States from the Trans-Pacific Partnership (TPP) this past January, many observers saw that decision as a boon for China. East Asia countries can no longer count on US-supplied public goods to maintain peace and deliver prosperity, they will face some tough choices.

Affirmative findings would give the president statutory authority to raise import barriers to protect domestic sources. But invoking national security to justify protectionism is an extreme measure—the “nuclear option” of international trade law—that would generate some undesirable consequences for U.S.-China relations, as well as for the rules-based trading system itself.

Trump’s election campaign promises and and the executive orders the new president signed after he came into the White House reveal a narrow-minded, conservative and selfish United States. It’s a startling reversal of the country’s outlook for six decades, and completely outdated.

The U.S. and China, facing mounting political pressures at home, are seeing economic tensions flare to their worst point in years over currency and trade practices.

In their first top-level trade talks since President Obama hosted China’s leader in September, the United States and China said on Monday that they had made progress on sticking points, including preventing the theft of trade secrets and opening the Chinese market more broadly to American multinationals.