Tension between the U.S. and other NATO members is driving countries in Europe to consider collective defense that¡¯s less reliant on America ¡ª yet the picture is much different in Asia.

The U.S. has deepened military coordination with its allies in the Indo-Pacific over the last few years, moving more missile systems, fighter jets and other weaponry into the region. It has also expanded the scale and complexity of joint training to prepare for potential crises, such as a conflict over Taiwan.

Demands on the U.S. military from the war against Iran have created some shortages in Asia, such as a Marine Corps Expeditionary Unit sent from Japan. U.S. President Donald Trump¡¯s transactional nature, including his recent remarks about arms sales to Taiwan being a ¡°negotiating chip¡± with China, worries allies and partner countries globally.