Updated

One of China's biggest state-run conglomerates is suing a Venezuelan counterpart in a U.S. court in a dispute over unpaid bills, a sign of Beijing's growing impatience with its crisis-wracked South American ally.

In the lawsuit filed Nov. 27 in a Houston federal court, a U.S. subsidiary of Sinopec seeks more than $23 million in damages from Venezuela's state-run oil company, PDVSA.

Sinopec alleges it never received full payment for 45,000 tons of steel rebar it delivered in 2013.

The dispute comes as Venezuela is seeking fresh financing to stay current on its huge foreign debt. China has yet to step in after having bankrolled Venezuela's socialist revolution to the tune of $65 billion between 2007 and 2016.

Local brokerage Caracas Capital revealed the court documents in a report Wednesday.