When presidents George W Bush and Obama visited Baghdad, they faced the risk of their Airforce One being shot down by rebel's stinger missile launchers.
President Biden's visit to Kyiv is even more dangerous as Russia has been bombarding there with missile attacks.
Yet, all of them proceeded with the bold trips to demonstrate their bravery, resolve and solidarity. It's American spirit.
我给拜登一个大大的赞！他太勇敢了， 英雄！