American invasion on Syria will have following effects:

1)It will promote sectarian conflicts in SYRIA.And such a conflict will intensify the proxy war between Iran and Saudi Arabia.And these proxy wars can engulf Jordan,Iraq and even Afghanistan.

2)Even if Assad's regime is toppled,it is highly likely that a group of extremists will take over the regime.And this will be the worst scenario when Al-Qaeda minded terrorists organisations will nourish and groom extremists and suicide bombers for their own militant strategies.

3)It will increase the rivalry among US,Russia and China.This will affect the Afghan peace process and will cause further instability in Afghanistan.