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In peace negotiations with Russia, a security guarantee for Ukraine might be contemplated to offset concessions on NATO membership, the exclusion of foreign forces from its territory, and perhaps certain limitations on its longer-range armaments. This paper examines options available in relation to security guarantees for Ukraine.

This background paper sets out the legal framework for analysis of the invasion of Ukraine by the Russian Federation and examines the implications for any political settlement.

This paper analyses the international law applicable to Russia and Ukraine on the disarmament and non-proliferation of weapons of mass destruction. It offers options for how the issue of WMDs may be addressed in any peace agreement between the conflict parties.

This paper examines the conditions for a comprehensive ceasefire between Ukraine and the Russian Federation and for the withdrawal of foreign forces from Ukrainian territory, based within the framework of international law.

The war in Ukraine brings to the surface long simmering tensions between Russia and the West – at the expense of Ukraine. The crisis is both a necessity and an opportunity to repair the European security architecture. This paper considers the options for that new security order.

Marc Weller is Professor of International Law and International Constitutional Studies in the University of Cambridge, the former Director of the Lauterpacht Centre for International Law and of the European Centre for Minority Issues, a former United Nations Senior Mediation Expert and a Barrister (Middle Temple) at Doughty Street Chambers.