Dr Fiona Hill, one of the lead reviewers on the UK's 2025 Strategic Defence Review, discusses an expansive approach to defence and security for the modern world.

Dr Hill, who served the first Trump administration as a Russia expert, brings deep insights into Russian, American and British defence policy making.

Having identified Russia's obsession with recovering the old Tsarist Empire's borderlands, and anticipated Putin's strategic use of economic power to create dependencies in the 1990s, she sheds light on the thinking of Presidents Putin and Trump, and what is now needed by societies used to a peace dividend.

She also explains the challenges faced by the drafters of the UK's Strategic Defence Review, with limited means available to respond to a transformed international environment, with Russia an enemy, and the USA now an economic rival and a less reliable ally.

Dr Hill is a senior fellow at the Brookings Institution in Washington DC and Chancellor of Durham University in the UK. She is on Harvard University's Board of Overseers, from where she gained her doctorate in history and was a Frank Knox Fellow. She co-authored Mr Putin: Operative in the Kremlin (2013) and The Siberian Curse: How Communist Planners Left Russia Out in the Cold (2003), both with Clifford Gaddy. She has been appointed a Companion of the Order of St Michael and St George by the UK and Knight First Class of Finland's Order of the Lion.