[MARKET UPDATE]: Markets chop to geopolitical headlines; Stocks gain and oil slides on reports that Iran agrees to halt enrichment in exchange for easing US sanctions; but some of the moves pare on reports chance of an agreement are extremely slim

Headline-driven chop around nuclear negotiation reports follows a well-worn script: an initial risk-on, crude-off impulse on the headline itself, followed by a partial fade once sourcing and probability are questioned. The transmission channels are distinct and worth keeping separate. On the crude side, the trade runs through expectations for returning sanctioned barrels and reduced freight, insurance and tanker friction; on the equity side, it is a broader geopolitical risk premium being priced in and out. Historically, the durable repricing in such episodes has come not from the talks themselves but from verifiable implementation steps, since interim optimism in drawn-out negotiations of this kind has repeatedly reversed on denials or stalled drafts. The distinction that matters is between a headline move, which mean-reverts quickly, and a confirmed framework, which shifts supply balances at the front of the oil curve. The tells are official confirmation or denial from either capital, movement in prompt crude spreads and shipping rates rather than flat price alone, and any parallel change in enforcement rhetoric. Until then, positioning around such reports tends to stay shallow and two-sided.