US imposes sanctions on Syrian president’s wife under Caesar Act

Asma al-Assad among dozens targeted in campaign to deny regime revenue and support

The Syrian first lady, Asma al-Assad, has been named in the first round of new US sanctions that are certain to intensify pressure on the embattled regime and its backers as the country's crippled economy continues to wither.

The law, known as the Caesar Act, came into effect on Wednesday, placing anyone who does business with 39 named individuals and regime entities in the cross hairs of the US Treasury. The sanctions are the toughest yet imposed on Bashar al-Assad and are set to be the centrepiece of a pressure campaign that also targets his government's two major backers, Iran and Hezbollah.