A similar book is Reidar Maliks, Kant’s Politics in Context. Oxford: Oxford University Press 2014, but it does not focus on international law. Pauline Kleingeld’s Kant and Cosmopolitanism: The Philosophical Ideal of World Citizenship, Cambridge: Cambridge University Press 2012 touches upon international relations, but is mainly a book on Kant’s cosmopolitanism, and a comparison with other 18c thinkers.