Joe Biden's exit could be a tricky subject for authoritarian leaders in Russia, China, and Saudi Arabia, analysts say

• Joe Biden exited the presidential race, endorsing Kamala Harris as his successor.
• Analysts say leaders like Vladimir Putin and Xi Jinping could interpret it as a sign of US decline.
• Authoritarians are not used to giving up power like Biden did, albeit under pressure.

In a dramatic but increasingly expected turn of events, Joe Biden exited the presidential race on Sunday via a letter posted on social media.