Ishiba, 68, came to power less than a year ago

LDP-led coalition may lose control of upper house, risking political instability

Lai Ching-te highlights deep bilateral relations in message to Shigeru Ishiba

Ishiba faces fragile minority government amid rising tensions with China and North Korea

The uncertainty sent the yen currency to a three-month low

Veteran succeeds in fifth and final leadership bid

Su Tseng-chang says China's military expansion undermines stability in Taiwan Strait