The condition Tehran has put to Washington is specific: continue targeting Iranian interests, and Iran will intensify and expand attacks on United States military vessels in the region. What complicates the read is that the warning is conditional. That framing makes it simultaneously a military threat and an implicit signal that the trajectory is still open to negotiation.
The case for treating this as an operational signal rather than theater is in the language itself. Tehran named the target class and described the direction of change: intensified and expanded attacks on American military vessels. That is a particular kind of warning. A threat that names the mechanism carries a different weight.
The counterargument is that conditional warnings are also instruments of negotiation. They create space for the other side to adjust, and that is sometimes the entire point. The risk is that this warning functions primarily as a pressure instrument, calibrated to move Washington's posture rather than to announce an imminent operation.
On balance, what has changed is that Iran has named the trigger, the target class, and the direction of escalation in a single statement. The line to watch is whether Washington adjusts its posture toward Iranian interests in the region. That adjustment, or the absence of one, is what determines whether Iran's conditional stays conditional.