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Public International Law

Allen & Overy advises national and international corporations, financial institutions, international organisations, governments and States on all contentious and non-contentious aspects of public international law. Our market-leading practice includes specialists in environmental law, regulatory compliance and risk management, dispute resolution, anti-bribery and corruption, anti-money laundering, public law, human rights and sanctions.

A&O’s public international law advisory work includes:

  • The drafting and interpretation of international treaties and conventions
  • Maritime, territorial and boundary rights
  • State succession
  • International sanctions regimes
  • Privileges and immunities of States and international organisations
  • Recognition of States and State succession
  • Title to natural resources and international environmental law
  • Use of force and international humanitarian law
  • Space law
  • Trade law

We also advise on contentious Public International Law matters, including State-to-State disputes under public international law, including boundary disputes, and have a market-leading investment treaty arbitration practice. 

Our experts have acted as counsel before international courts and special tribunals, such as the Iran-US Claims Tribunal, and advised states on out-of-court strategies for dispute resolution, including before UN fora. We are also one of only a handful of law firms with experience of contentious World Trade Organisation proceedings.

News & insights

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News: 21 MAY 2020

The Federal Election Commission regains a quorum in the middle of the 2020 election cycle: Enforcement, audits, advisory opinions, or not so fast?

For the last nine months, the civil enforcement authority over federal campaign finance laws has lacked a quorum to hold meetings or vote on matters, routine or otherwise.  On May 19, 2020, the Senate…

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Publications: 12 MAY 2020

23 EU Member States sign an agreement to terminate intra-EU bilateral investment treaties

Further to the decision of the Court of Justice of the European Union (the Court) in Case C-284/16 Slowakische Republic v Achmea BV on 6 March 2018 (previously reported on here) (Achmea), 23 EU Member…

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Publications: 17 FEBRUARY 2020

U.S. Treasury implements Final FIRRMA Regulations

This week, new regulations promulgated by the U.S. Department of the Treasury (the Treasury) went into effect to finalize and comprehensively implement the Foreign Investment Risk Review Modernization…

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Publications: 29 NOVEMBER 2019

Distorting mirrors: UK sanctions and Brexit

The UK’s various sanctions regimes are currently very strongly correlated, although not completely aligned, with those of the EU. This position arises, in part, from the direct applicability of…

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Awards and achievements

  1. Tier One, Public International Law, Legal 500 UK 2019
  2. Band 1, Dispute Resolution, Global-wide, Chambers Global 2019
  3. International Arbitration Firm of the Year, Benchmark Litigation Asia-Pacific Awards 2019
  4. Best Arbitration Team of the Year in Spain and Portugal, 2019 
 

Recognition