States

China

Iran's largest oil customer and a major arms-component supplier; not a security guarantor. Stake in regional stability is primarily economic.

Role in conflict

China's role in the Iran-Gulf crisis is shaped by three factors: it is the largest single buyer of sanctioned Iranian crude, it is a treaty partner of Iran under the 25-year cooperation agreement, and it brokered the 2023 Saudi-Iran normalisation. It is also the largest external trade partner of every Gulf state and depends on Hormuz for a substantial share of imported energy. Beijing's preferred outcome is stability without US success — it neither wants regional war nor wants to underwrite a US-led security architecture.

Objectives

Stable oil flows through Hormuz at predictable prices
Maintain Iran as a counterbalance to US influence without committing to defend it
Expand the role of the renminbi in regional energy trade
Avoid escalation that would force a costly diplomatic position

Red lines

Sustained Hormuz disruption
Material disruption to Chinese energy imports would shift Beijing's diplomatic activity sharply.
US regime-change against Iran
Direct US action to topple the Iranian regime would be opposed publicly and through UNSC mechanisms.

Constraints

Limited military reach into the region
Sanctions enforcement risk to Chinese financial institutions in dollar system
Need to maintain relationships with Saudi Arabia and UAE simultaneously

Allies

russia
iran

Caveats

Chinese diplomatic posture in public differs from technical posture (oil purchases, banking workarounds). Both are part of the picture.