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Holger Hestermeyer

@hhesterm

Professor of Int’l & EU Law, Diplomatic Academy Vienna. Past: Prof., founding Director CIGAD at King's College London, specialist adviser House of Lords EU Select Committee, Référendaire CJEU

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Latest posts by Holger Hestermeyer @hhesterm

Merz statements raise an interesting strategic issue: do leaders have to speak up in public (which Merz decided not to do, clearly they had decided that in advance) or is it better and more efficient if they speak up in private. Spain certainly was irritated by Merz.

06.03.2026 18:34 👍 6 🔁 1 💬 2 📌 1
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International Law Without Law YouTube video by Diplomatische Akademie Wien

I am very grateful to Sally Langrish, Legal Adviser to the FCDO, to comment on my inaugural lecture at the Diplomatic Academy in Vienna on "International Law without Law". If you are curious... www.youtube.com/live/FUCSw-9...

06.03.2026 18:08 👍 10 🔁 2 💬 0 📌 1
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“The Unwillingness to Call This Illegal Is a Terrible Mistake”

An interview with the indefatigable, formidable @oonahathaway.bsky.social. @asilorg.bsky.social is fortunate to have her as president-elect at this critical moment in time. verfassungsblog.de/the-unwillin...

06.03.2026 18:05 👍 6 🔁 1 💬 0 📌 0

"No stupid rules of engagement ... no politically correct wars" US Secretary of Defence Pete Hegseth

06.03.2026 17:58 👍 57 🔁 28 💬 4 📌 2

Apart from the obvious absurdity of his statement, this is exactly the same lie that Putin told to his population.

06.03.2026 13:48 👍 38 🔁 19 💬 2 📌 1

The blockade of the strait of Hormuz seems to bite

06.03.2026 07:34 👍 16 🔁 4 💬 0 📌 0
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Exclusive: US investigation points to likely US responsibility in Iran school strike, sources say Military investigators believe it is likely that U.S. forces were responsible for an apparent strike on an Iranian girls' school that killed scores of children on Saturday, two U.S. officials told Reu...

A reminder that international law and rules of engagement are there for a reason - and if you simply dismiss them, things like these become more likely www.reuters.com/world/middle...

06.03.2026 07:31 👍 28 🔁 19 💬 0 📌 0
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24 states sue Trump administration over tariffs imposed after Supreme Court ruling Two dozen states filed a lawsuit challenging President Trump's legal authority to impose new global tariffs.

And here we go, states attack Trump’s 122 duties www.cbsnews.com/news/trump-t...

05.03.2026 21:56 👍 9 🔁 4 💬 0 📌 0

That sounds like Orban has been demoted to a law clerk and is now creating weird EU law hypos.

05.03.2026 21:42 👍 10 🔁 5 💬 2 📌 0

It read that as a reference to your impressive hair…

05.03.2026 21:39 👍 1 🔁 0 💬 1 📌 0

The support of international law by the population is more solid than politicians' statements seem to indicate.

05.03.2026 19:33 👍 22 🔁 7 💬 0 📌 0

US IEEPA Tariff refunds - the hearing showed the irritation of the judge with the delay - and with the argument that this is all complex. In fact, the judge pointed out that computers exist when the government argued they'd have to go through everything manually.

www.nbcnews.com/news/us-news...

05.03.2026 14:01 👍 8 🔁 2 💬 1 📌 0

It is quite astonishing to remember the Iraq war, the demise of a brutal dictator there, the principled opposition of France and Germany, the chaos and regional instability that followed vindicating French and German opposition - and to see only Sanchez have the courage to take a stance.

04.03.2026 12:02 👍 313 🔁 77 💬 8 📌 2

The EU has the tools to stand up to the US (read anti-coercion instrument) and I read @olofgill.bsky.social's statements to mean it is ready to use them if Trump really blocks all trade with Spain because Sánchez dares criticize him. The EU has to stand together.

04.03.2026 11:02 👍 45 🔁 15 💬 1 📌 0

(Perdí un montón de confianza en políticos estos años pero sigo con la esperanza que non mentiría sobre esto en una entrevista)

04.03.2026 07:53 👍 0 🔁 0 💬 0 📌 0

In the sense that Metz alleges that he did that. I am not a fan, but at least in this regard I still have faith that he wouldn’t lie on that.

04.03.2026 07:50 👍 1 🔁 0 💬 1 📌 0

Verdad - pero si es verdad (y espero que lo es) hacerlo en privado es más efectivo por lo agresivo que Trump es en público.

04.03.2026 07:48 👍 1 🔁 0 💬 1 📌 0
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Interview mit Kanzler Merz: "Es kann auch einen Zeitpunkt geben, der zu spät ist" Kanzler Merz ist als erster europäischer Regierungschef nach Beginn des Krieges im Weißen Haus empfangen worden. In den tagesthemen verteidigte er den Angriff auf Iran durch die USA und Israel. Beide ...

One positive aspect of Merz’ visit to Trump: he confronted Trump on his threat to cut economic ties with Spain and told Trump Spain cannot be excluded from the US-EU deal. Trump apparently claimed he could use Spanish basis without consent if he wanted. www.tagesschau.de/inland/merz-...

04.03.2026 07:20 👍 38 🔁 14 💬 1 📌 3
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Interview mit Kanzler Merz: "Es kann auch einen Zeitpunkt geben, der zu spät ist" Kanzler Merz ist als erster europäischer Regierungschef nach Beginn des Krieges im Weißen Haus empfangen worden. In den tagesthemen verteidigte er den Angriff auf Iran durch die USA und Israel. Beide ...

La Tagesschau reporta que este último punto no es completamente correcto y que el afrentó la amenaza de cortar las relaciones economicas y dijo a Trump que no puede excluir España de un tratado con la UE. www.tagesschau.de/inland/merz-...

04.03.2026 07:16 👍 0 🔁 0 💬 1 📌 0
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NEW: A federal appeals court swiftly rejected the Trump administration’s request to delay next steps in the fight over tariff refunds for importers after the US Supreme Court struck down the president’s signature economic policy
www.bloomberg.com/news/article...

02.03.2026 17:34 👍 263 🔁 100 💬 7 📌 0

The American Society of International Law has published a statement on the US Use of Force against Iran

02.03.2026 17:19 👍 22 🔁 13 💬 1 📌 1
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One quick point on legality, as the UK rightly points out Iran attacking countries that did not participate in US action in turn gives rise to self-defence

02.03.2026 14:51 👍 15 🔁 1 💬 1 📌 0

Spain does not allow uses of its airbases for the US-Iran war. They flew to Ramstein - any comment on the German government’s stance?

02.03.2026 14:40 👍 23 🔁 12 💬 4 📌 0

Immunity is likely to still pose a problem. I didn't follow in detail which assets precisely are at issue here.

02.03.2026 13:58 👍 1 🔁 0 💬 0 📌 0
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Ex-Yukos investors can enforce $65 billion arbitration award against Russia in UK, court rules Former Yukos investors can seek to enforce an arbitration award against Russia now worth more than $65 billion over the seizure of the defunct oil group, London's High Court ruled on Monday.

Some news from the Yukos award, the largest ISDS award ever made... www.reuters.com/sustainabili...

02.03.2026 13:52 👍 5 🔁 3 💬 1 📌 0

It sounds like not having a plan for what comes afterwards is sold as an advantage…

02.03.2026 13:34 👍 12 🔁 10 💬 2 📌 0

One of the many problems of public debate is that some thrive on the problems created by one conflict, then thrive on driving the next conflict pretending problems don’t exist, then thrive on the problems again. Commentary is cheap and being utterly wrong repeatedly does not lead to consequences.

02.03.2026 13:21 👍 12 🔁 2 💬 0 📌 0

The US science crisis deepens

02.03.2026 11:31 👍 24 🔁 8 💬 0 📌 0

One cannot help but have the impression that China is building the future.

02.03.2026 10:07 👍 30 🔁 1 💬 2 📌 0
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China to implement zero tariffs on imports from 53 African countries China will implement zero‑tariff treatment for imports from the 53 African countries with which it has diplomatic relations, starting May 1, 2026, state media reported on Saturday.

China removes all tariffs for imports from 53 African countries starting May 1. www.reuters.com/world/asia-p...

02.03.2026 10:05 👍 32 🔁 12 💬 2 📌 0