Washington turns its Pax Silica declaration into an exclusivity clause for 35 signatories

The US State Department has prepared letters to 35 countries warning that joining a China-led artificial intelligence bloc would exclude them from the US-led AI supply chain, Reuters reported on 14 August, local time ^[1][2]. The 35 are the signatories of the Joint Statement on the AI Opportunity Partnership from June's Second Pax Silica Summit in Washington, which means a declaration signed as a statement of intent is now being read back to its signers as a condition of access ^[3].

South Korea, Japan and Australia are among the recipients, according to Reuters ^[1][4]. That leaves 32 other governments on the list receiving the same instruction ^[14].

The drafting is unusually blunt for a diplomatic note. According to the draft quoted by Reuters, "seeking to belong everywhere is the same as belonging nowhere," and "signing the Pax Silica declaration signifies solidarity and commitment, not mere membership" ^[5]. Recipients, the draft says, "cannot simultaneously maintain membership in initiatives that conflict with our expectations" ^[6]. It does not name China ^[6]. A senior US official told Reuters the letter was written "to make clear that you cannot benefit from both sides," adding that if a country claims to be a reliable partner of the United States while joining China's AI initiative, "we have to question whether that country can be trusted" ^[7].

The mechanics matter more than the language. Pax Silica was launched as an AI supply-chain body under State Department leadership in December of last year ^[8]. China responded last month by establishing the World Artificial Intelligence Cooperation Organization with Russia and others ^[9]. Kazakhstan, the only Central Asian member of Pax Silica, joined WAICO as well ^[10]. That is the live test case: one government has already done the thing the letter is meant to prevent, and as reported the draft specifies no list of prohibited bodies, no definition of which parts of the supply chain are withheld, and no named penalty ^[5][6].

Reuters characterised the pressure as a strategy to stop China from securing resources in the AI race, which will be central to the contest for military and economic supremacy ^[11]. The competition already runs across the full stack, from models to semiconductors to power ^[12], so "supply-chain access" is a lever with a wide and undefined blast radius. For a trade ministry in Seoul or Canberra, the operative question is not whether to sign a declaration but which export licences, chip allocations or equipment approvals are being implicitly attached to it.

Timing is the other open variable. It has not been confirmed when the letters will be sent ^[13]. Xi Jinping is expected in the United States around the 24th of next month, reciprocating Donald Trump's visit to China last May ^[15]. Sending exclusivity demands to 35 capitals in the weeks before that meeting is a different act than sending them after it.

Watch three things: whether the letters go out in the reported form or get softened before dispatch ^[13][5]; whether any signatory asks publicly for the list of initiatives that "conflict with our expectations," which would force Washington to write the rule down ^[6]; and what happens to Kazakhstan, whose dual membership is the only available precedent for how the threat is actually enforced ^[10].