China and Russia joined Iran in denouncing US sanctions and backed efforts to restore a landmark nuclear deal with Tehran that President Donald Trump abandoned in his first term and now wants to replace.

China is hosting diplomats from Iran and Russia for talks on Iran’s nuclear program Friday as Beijing aims to position itself as a power broker on an issue seen internationally as a pressing security concern.

Representatives of China, Russia and Iran have called for an end to U.S. sanctions on Iran over its rapidly advancing nuclear program and a restart to multinational talks on the issue.