Here's a thing that was politically frozen yesterday and looks unfrozen today: standing beside Turkish President Recep Tayyip Erdoğan, U.S. President Donald Trump said Washington will lift the CAATSA sanctions imposed on Turkey and will decide on selling it the F-35 stealth fighter, according to Reuters. The sanctions were the penalty for Turkey buying the Russian S-400 air-defence system, as The Times of Israel reports.

So the same purchase that got Turkey thrown out of the F-35 programme and sanctioned is now the thing being forgiven to bring it back in. That symmetry is the whole story.

Why this is a bigger deal than a sanctions line-item

CAATSA — the 2017 U.S. law that mandates sanctions on those who transact significantly with Russia's defence sector — was applied to Turkey, a NATO ally, in December 2020, the first time the statute hit a treaty partner. Lifting it would close a five-year rift that pushed the alliance's second-largest army toward the diplomatic cold. Trump framed the shift while hosting Erdoğan at the White House, as Anadolu Ajansı describes it, and left the F-35 sale as a decision still to come rather than a done deal, per Al-Monitor.

The through-line: the S-400 never went away

Here's the part worth slowing down on. Turkey was cut from the F-35 in 2019 on a specific technical argument: you cannot operate a Russian S-400 radar-and-missile system in the same air force as a Western stealth jet, because the S-400 could be used to learn the F-35's signature. That concern was never resolved by anyone changing the aircraft — it was resolved by keeping the two apart.

Hypothesis: reintegrating Turkey into the F-35 without a public accounting of the S-400 quietly retires that objection. Supporting this: the sources record a pledge to lift sanctions and consider the sale, but none of them cites any Turkish concession on the S-400 itself. Against this: Trump has only said he will decide on the F-35, not that he has approved it, as Reuters notes — leaving room for the radar question to be handled before any jet is delivered. What the S-400 batteries do next is the fact to watch, and the sources do not settle it.

Why it matters: This is a cross-border realignment, not a domestic policy tweak. Ankara sits on the Black Sea and the Syrian border and controls the Turkish Straits; bringing it back inside the F-35 tent changes the deterrence picture on NATO's southeastern flank and in the airspace around Russia. But if the S-400 stays in service, the alliance would be absorbing a member that operates both Russian and American frontline systems — a precedent every future buyer will notice.

The honest caveats

  • This is a stated intention, not a signed instrument. Reuters and Al-Monitor both frame the F-35 as a decision Trump will make, not one he has made.
  • The sources give no timeline, no dollar figure, and no detail on what — if anything — Turkey gives up in return.
  • CAATSA is a statute. How far a president can waive or unwind its sanctions, and whether Congress pushes back, is not addressed in the reporting here and remains an open question.

What to watch next

  1. Any signal on the S-400 — mothballing, transfer, or continued operation. That single data point tells you whether this is a genuine security fix or a diplomatic paper-over.
  2. Whether the sanctions relief is formalised in writing, and how Congress reacts to a CAATSA rollback for a treaty ally.
  3. Moscow's read: an S-400 buyer being welcomed back into Western stealth aviation is a story the Kremlin will want to tell its other customers.

If it lands cleanly, this is a rift healed and an ally brought back in from the cold — the kind of institutional repair that is hard to pull off. Whether it also quietly normalises operating Russian air defence inside NATO is the thing that will define what the bargain was actually worth.