U.S. Treasury Secretary Janet Yellen visits China this week with the goal of finding areas of common economic ground and opening communication channels amid an increasingly turbulent relationship between the world¡¯s two biggest economies.

It will be the first major test of a policy she outlined in April that¡¯s geared toward defending and securing U.S. national security without trying to hold China back economically.

Yellen¡¯s arrival Thursday comes days after China imposed restrictions on exporting two metals that are crucial to key technology industries, the latest escalation in a trade war that ramped up last year with U.S. export controls on semiconductors and chipmaking equipment.