Yemeni Armed Forces is to announce a qualitative military operation deep inside Saudi territory at 09:40BST/04:40EDT

Pre-announced operations of this kind from the Yemeni armed forces have historically fallen into two camps that trade very differently: strikes on Saudi energy infrastructure, which have on past occasions taken material volumes of crude processing offline and forced a rapid reassessment of spare capacity and outage duration, and strikes on military or symbolic targets, which have tended to produce a brief crude risk premium that fades once the absence of supply damage is confirmed. The transmission channel is the front of the Brent curve and prompt timespreads in the first instance, with freight and war-risk insurance rates following if shipping or export facilities are implicated. The announced timing is itself worth noting: telegraphed operations have sometimes been framed for deterrence effect rather than maximum damage, and the substance of the announcement will distinguish a one-off demonstration from the resumption of a sustained campaign. The principal follow-ons are Saudi confirmation of any impact, the identity of the target set, and any response from the coalition or its backers, since retaliation cycles have historically been the point at which a contained premium becomes a persistent one. Track record on claims from this source has been mixed, so confirmation from Riyadh carries more weight than the announcement itself.