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Russia exits the Black Sea Grain Initiative — and wheat falls

Jul 2023

The lesson: The headline exit rallied wheat briefly, then ample supply and alternative routes dominated: wheat -14.9% two months later. The exit was telegraphed for months — inspections had already slowed and some buyers had pre-positioned (Rabobank) — and Russia harvested a record crop instead of weaponizing supply. Observed in this episode; not a rule about exits.

What happened

The Black Sea Grain Initiative, signed 22 Jul 2022 by Russia, Ukraine, Turkey and the UN, reopened Odesa, Chornomorsk and Pivdennyi under a Joint Coordination Centre — about 32.9 Mt of grain shipped to 45 countries (EU EEAS). Russia had been progressively slowing inspections for months. On 17 Jul 2023 it withdrew, ending the deal; days later it struck Odesa-region and Danube port infrastructure. By October 2023 Ukraine was running its own corridor without Russia.

Weather context
  • Ukraine (Black Sea centroid, Odesa area) (Jun-Dec 2023): +2.02°C vs the 1991–2020 baseline; rainfall +13.8% vs baseline (178 days with <1mm rain). Hot but not dry in this window: +2.0 C vs baseline with rainfall above normal.

One region centroid is illustrative, not field-level truth; baseline is the 1991–2020 day-of-year mean. Weather data provided by Open-Meteo.com.

What everyone expected

Farmers Weekly (17 Jul 2023): wheat prices jump as Russia halts the deal. After late-July strikes on Odesa and the Danube, Bloomberg (27 Jul 2023): wheat hit a five-month high — the fear was a fresh bout of destabilizing global food inflation.

What the official numbers expected · USDA WASDE (as-published vintages)

What the official numbers said at the time (USDA WASDE vintages, as published): the June 2023 vintage projected world wheat ending stocks of 271 Mt for 2023/24. After the exit, July cut that to 267 Mt and August to 266 Mt - a roughly 2% downward revision, not the supply cliff the July price rally priced. (USDA WASDE, world wheat supply/use, 2023/24 marketing year, million metric tons; vintages released 9 Jun, 12 Jul, 11 Aug 2023.)

As reported at the time: Farmers Weekly, 17 Jul 2023 · Bloomberg via Moneyweb, 27 Jul 2023

What actually happened

  • Wheat
    Jun 2023 → Jul 2023 · ZW=F month-end closes
    +4.6%

    The exit month: a shrug. CBOT spiked to $6.86/bu on the headline and fell back within half an hour (World Grain, 17 Jul 2023).

  • Wheat
    Jun 2023 → Sep 2023 · ZW=F month-end closes
    -14.9%

    Two months after the exit, wheat was down — the counterexample in one number.

  • Corn
    Jun 2023 → Sep 2023 · ZC=F month-end closes
    -14.0%

    Corn fell alongside wheat through the exit arc.

  • Wheat
    Jun 2023 → Dec 2023 · ZW=F month-end closes
    -1.3%

    By year-end roughly flat versus before the exit — the feared escalation never compounded.

The exit was telegraphed for months. Rabobank's Stephen Nicholson: 'The market has been anticipating this for quite some time... buyers have been anticipating this as well, so they either stocked up or made sure their alternative supply channels are functioning well.' Eurasia Group: no fresh bout of destabilizing food inflation expected near-term. The real variable, analysts said, was whether Russia would weaponize its own wheat exports — it didn't; it exported a record instead.

The assessment

Three things killed the rally before it started: the exit was telegraphed for months — inspections had already slowed and some buyers had pre-positioned (Rabobank's Stephen Nicholson); Russia harvested a record 104.2 MMT wheat crop in 2022 (Rosstat final 104.237 MMT) and exported it aggressively instead of restricting supply, flooding the market it had just 'closed'; and Ukraine built its own corridor by October. The FT's verdict on 20 Sep 2023: wheat futures had fallen by more than a fifth since the deal ended, to a three-year low.

How this record has changed

Living document — every material change is logged here, newest first.

  1. New evidence2026-09-15

    Added two evidence lines: ERA5 weather reanalysis context for the event window (anomaly figures vs 1991-2020 baseline; weather data provided by Open-Meteo.com) and 'what the official numbers expected at the time' from USDA WASDE as-published vintages (expectations, not outcomes). Both from Morrowfly research vintage v1_2026-09-15; raw series stay in research.

    Morrowfly research vintage v1_2026-09-15 (ERA5 reanalysis via Open-Meteo; USDA WASDE as-published vintages)

  2. Correction2026-09-15

    An independent adversarial review cut unproven claims about how markets had positioned, replacing them with what was verifiable: a telegraphed exit, slowed inspections, and a record Russian crop. No new outcome data was added.

    Morrowfly internal adversarial review (15 Sep 2026)

Transmission

  • Wheat
    export restriction

    Ukrainian corridor revoked — but volumes had already shrunk for months as Russia slowed inspections, so the physical loss was smaller than the headline.

  • Corn
    export restriction

    Ukrainian corn had been the corridor's largest flow (17 Mt of 32.9 Mt shipped); by exit day buyers had pre-positioned alternatives.

Sources

Notes

  • Prices are month-end closes from our series unless noted; windows are labeled beside each number.
  • Secondary press quotes are reported as published and were not individually audited against primary sources.
  • Illustrative scenario record. Not a prediction. Not financial advice.