What is TurkStream?: TurkStream is a Russian natural gas pipeline running 930 km under the Black Sea from Russia to Turkey, then overland through Bulgaria, Serbia, and Hungary. Built by Gazprom and opened in January 2020, it carries up to 31.5 billion cubic metres per year.
Who tried to sabotage TurkStream in April 2026?: Explosives were found in two backpacks near the TurkStream pipeline at the Serbia-Hungary border on 5 April 2026. Serbia classified it as attempted sabotage by a foreigner. Ukraine denied involvement, and the VBA director confirmed Ukraine did not organise it, contradicting the Hungarian government's framing.Source: Serbian Military Security Agency (VBA)
Why does Hungary depend on TurkStream gas?: Hungary has refused to diversify away from Russian gas and relies on TurkStream for the majority of its supply. Prime Minister Orban has actively resisted EU pressure to cut Russian energy imports.
Does the EU ban on Russian gas affect TurkStream?: The EU's phased gas embargo beginning April 2026 is designed to eliminate Russian gas imports, which would eventually make TurkStream commercially moot for EU members. However, Hungary has blocked EU-wide enforcement, and non-EU Serbia is not bound by the embargo.
What is the actual TurkStream flow in April 2026 after the Reuters correction?: Reuters calculations on ENTSOG data put TurkStream average April flow at 41 MCM/day, down 25.5% month-on-month but only 1.7% year-on-year against April 2025. March was the front-loading anomaly, not April.Source: Baird Maritime / Reuters / ENTSOG
Why did EADaily's TurkStream figure mislead the market for a week?: EADaily cited Gazprom data in a single-source report. Gazprom has not published monthly statistics since January 2023, leaving no official counter-source to verify or challenge the figure until Reuters calculated its own ENTSOG-based estimate.Source: Lowdown / EADaily
What is TurkStream's capacity and who depends on it?: TurkStream has a capacity of 31.5 billion cubic metres per year. Hungary, Serbia, Slovakia, Austria, and the Czech Republic depend on its Central European line for the bulk of their remaining Russian gas supply.Source: Gazprom / ENTSOG
What happened at TurkStream near the Serbia-Hungary border in April 2026?: Serbian authorities intercepted backpacks containing 4 kg of plastic explosives near the TurkStream pipeline on 5 April 2026. Serbia's VBA director publicly denied Ukrainian involvement, contradicting the Hungarian government's framing ahead of its 12 April elections.Source: Serbian VBA / Lowdown

Background

TurkStream's April 2026 flow data was the subject of the most significant source-correction the European Energy Markets briefing has recorded. On 27 April, EADaily reported that Gazprom deliveries via TurkStream had fallen to 40.3 MCM/day, framing a -25% month-on-month drop as a potential supply disruption story. Reuters calculations on ENTSOG data confirmed the average April flow at 41 MCM/day — broadly matching the volume, but collapsing the framing: the MoM drop measured against March front-loading; the YoY comparison against April 2025 was only -1.7% (1.23 bcm vs 1.25 bcm). The Gazprom statistical blackout since January 2023 is the structural condition that allowed a tier-3 single-source figure to dominate the narrative for a week.

ACER's 6 May 2026 derogation opinions named Hungary and Slovakia as the two EU member states most dependent on TurkStream, granting exemptions from applying EU gas network codes at third-country interconnection points from 5 August 2026 — pending simultaneous implementation by Russian and Turkish operators. This adds a regulatory exposure dimension to a supply route that had already surfaced a physical threat: on 5 April 2026, explosives were found near the Serbia-Hungary border segment. Serbia's VBA director publicly denied Ukrainian involvement, contradicting Hungarian government framing ahead of the 12 April elections.

TurkStream is now one of only two remaining routes for Russian gas to reach European buyers, the other being Druzhba pipeline transit. It runs 930 km under the Black Sea from Anapa to Kiyikoy, with an overland line through Bulgaria, Serbia, and Hungary into Central Europe. Capacity is up to 31.5 bcm/year. Hungary and Serbia's continued reliance puts them structurally at odds with Brussels on embargo expansion; ACER's derogation opinions formalise this tension at the regulatory level.

TurkStream is a natural gas pipeline built by Russia's Gazprom, opened in January 2020, running 930 km under the Black Sea from Anapa on the Russian coast to Kiyikoy on the Turkish coast. From there it splits into two lines: one supplying Turkey domestically, the other running overland through Bulgaria, Serbia, and Hungary to distribute Russian gas to Central and Southern Europe. It was conceived as a bypass after the termination of South Stream and carries up to 31.5 billion cubic metres per year.

On 5 April 2026, explosives were found in two backpacks hundreds of metres from the TurkStream pipeline near the Serbia-Hungary border. Hungary deployed military units to protect the pipeline within hours. Ukraine denied involvement, and Serbia's Military Security Agency (VBA) director Djuro Jovanic publicly confirmed that Ukrainians did not organise the sabotage attempt, directly contradicting Hungarian government framing in the run-up to the 12 April elections. The four-jurisdiction land route , Bulgaria, Serbia, Hungary, and the EU border , means a single military deployment cannot secure the full overland segment.

TurkStream is now one of only two remaining routes for Russian gas to reach European buyers, the other being Druzhba pipeline transit through Ukraine. With the EU's phased gas embargo from April 2026, Hungary and Serbia's continued reliance on TurkStream puts them at odds with Brussels and illustrates how pipeline geography shapes political alignment in the war.