U.S. Treasury Secretary Janet Yellen called on "trusted" U.S. allies to strengthen trade relationships to shore up global supply chains disrupted by the pandemic, worsened by Russia's war in Ukraine and threatened longer term by a reliance on China.

In her longest public address during a three-stop tour of East Asia, Yellen touted her "friend-shoring" concept as a way to reduce the vulnerabilities of a supply system badly strained over the past two years, and as a mechanism for reducing inflation in the U.S. and elsewhere.

"Friend-shoring is about deepening relationships and diversifying our supply chains with a greater number of trusted partners to lower risks for our economy and theirs," Yellen said, in a speech delivered Tuesday at a research-and-development facility in Seoul run by South Korean conglomerate LG.

"In so doing, we can help to insulate both American and Korean households from the price increases and disruptions caused by geopolitical and economic risks," she said.

LG Energy Solution and LG Chem already has plans to invest at least $11 billion in the U.S. by 2025, said Shin Hak-Cheol, chief executive at LG Chem, at the joint press conference with Yellen.

Globally, including in the U.S., LG Chem will spend $4.5 billion on developing diverse materials used for batteries, such as cathode-active materials, separators and carbon nanotubes, Shin added.

The Treasury chief singled out China, which has come in for increasing criticism from the Biden administration over a number of issues, as a country on which the U.S. and others should be less reliant.

"We cannot allow countries like China to use their market positions in key raw materials, technologies or products to disrupt our economy or exercise unwanted geopolitical leverage," she said.

While in Tokyo last week, she also castigated Beijing for failing to coordinate with other major creditors to help heavily indebted countries, like Sri Lanka, that are struggling with a slowing global economy, high inflation and a strengthening dollar.

Yellen is scheduled to meet Tuesday with South Korean President Yoon Suk Yeol, Finance Minister Choo Kyung-ho and Rhee Chang-yong, governor of the Bank of Korea. She'll also meet a group of female entrepreneurs to discuss expanding opportunities for women in the Korean economy.

Yellen traveled to Seoul after attending a gathering of finance ministers from the Group of 20 leading economies. She began her 10-day journey, her first to Asia as head of the Treasury, with a stop in Tokyo.

Christopher Condon and Heejin Kim report for Bloomberg News.

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