The measures, which took effect on Monday, follow US President Donald Trump's decision to abandon a multi-nation nuclear deal with Tehran, which he said was flawed and does not adequately constrain Iran's destabilising behaviour in the Middle East.
"We believe that China's normal cooperation (with Iran) within international law is legal and legitimate, and this shall be respected."
The US has given temporary exemptions to eight countries -- including India, Japan and Turkey -- to continue buying oil in a bid to avoid disrupting their economies and global markets.
The remaining members believe the agreement is working as intended and is keeping Iran from obtaining nuclear weapons for now.
"Under the current circumstances, we hope all parties can bear in mind the larger picture and fulfil their duties and choose to stand on the right side of history," Hua said, adding that China will continue to "uphold the objective and responsible attitude to uphold the agreement".
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)