A State Department spokesman spoke to Al Jazeera in response to Bashar al-Assad's visit to the UAE.
Al Jazeera Telegram Channel quoted a US State Department spokesman as saying:
We regret the efforts to legitimize Bashar al-Assad.
During a visit to the UAE on Friday, Bashar al-Assad met with a number of UAE officials, including Dubai Governor Mohammed bin Rashid Al Maktoum and Abu Dhabi Crown Prince Sheikh Mohammed bin Zayed Al Nahyan.
Syria has been the scene of deadly clashes since 2011 between Syrian army forces and terrorist and extremist groups fighting the central government.
Numerous reports, including in the Western media, indicate that Western countries have provided arms, intelligence, and logistical support to these groups to overthrow the Syrian government.
However, a US State Department spokesman told Al Jazeera that Bashar al-Assad was responsible for the deaths of many Syrians. He said:
Those who want to interact with the Assad regime must consider his crimes.