Leaders from the Group of Seven wealthy democracies are meeting in Hiroshima, Japan, with Russia's $4-5 billion annual trade in diamonds in the crosshairs.
Assad arrived in the Red Sea coastal city of Jeddah on Thursday for the Arab League gathering, his first since the bloc suspended Syria in 2011 over the brutal crackdown on pro-democracy demonstrators that led to civil war.
"This accomplishment represents an important step forward in strengthening the US-Taiwan economic relationship," US Trade Representative (USTR) Katherine Tai said in a statement on Thursday.
The prohibition signed into law by Governor Greg Gianforte will serve as a legal test for a national ban of the Chinese-owned platform, something that lawmakers in Washington are increasingly calling for.