SEOUL, Nov. 7 (UPI) -- After the inauguration of the Donald Trump in January, the South Korean government and its corporations were pressed to invest hundreds of billions of dollars in the United States to avoid high tariffs.

Observers expressed concern Friday that such large-scale overseas investments could end up harming Asia's fourth-largest economy, which heavily depends on the manufacturing industry.

Late last month, Seoul agreed to invest $200 billion in cash and $150 billion in shipbuilding and other industrial projects in the United States over the coming years, with an annual ceiling of $20 billion.

In return, Washington would reduce tariffs on Korean exports to 15% from 25%, honoring the terms agreed upon in late July. Trump also vowed to provide propulsion technology to help the key U.S. ally in East Asia build a nuclear-powered submarine.

The deal coincided with Trump's visit to Korea to meet his counterpart, President Lee Jae Myung, on the sidelines of the Asia-Pacific Economic Cooperation Summit.