On December 1st, 2025, SAIS Europe hosted Sir Laurie Bristow for a lecture on how Russia's war on Ukraine might end and what the conflict signals for European security. Sir Laurie served as the United Kingdom's Ambassador to Russia from 2016 to 2020 and Ambassador to Afghanistan during the fall of Kabul in 2021. He now leads Hughes Hall at the University of Cambridge.

Sir Laurie began by describing the war as one that has settled into a static but destructive contest of attrition. Russian casualties likely exceed one million and, although Ukraine has lost fewer troops, it faces deeper structural pressure because attrition ultimately favors the larger power. Neither side is positioned to achieve an outright victory and current trends suggest that Ukraine is losing ground over time.

He then then turned to early US efforts to force a ceasefire. The new administration put pressure on Ukraine by restricting the supply of arms and intelligence to Kyiv, and pushed Ukraine into commercial arrangements with US firms; the US administration did not put comparable pressure on Russia but instead pursued unconditional direct engagement with Putin. He argued that these moves reflected a familiar but flawed belief that personalized diplomacy could reshape Putin's objectives. The result was the 28-point negotiating plan that circulated towards the end of 2025, which Sir Laurie described as poorly constructed, internally inconsistent and aligned in many ways with Russian interests. Moscow accepted it as a basis for talks not because it advanced compromise but because it edged negotiations closer to its preferred outcome.

According to Sir Laurie, any credible assessment of how the war might end must begin with why it started. Putin's goals, in his view, center on restoring Russian Great Power status on a par with the US, , subordinating Ukraine and undoing what Putin perceives as the humiliations of the post-Cold War order. The invasion cannot be understood as a defensive reaction to NATO aggression or as a territorial dispute. It is rooted in neo-imperial ambition and a deeply emotional resentment of the post-Cold War international system.

The lecture then moved into the broader forces shaping Russia's trajectory. The economy will not collapse quickly, but the long-term cost of sustaining a war economy will be severe. The most important factor for Russia's long term stability is the political succession. With weakened institutions and no predictable mechanism for transferring power, Russia faces serious risks whenever Putin leaves the scene. He also noted that Russia's reliance on China has grown sharply, giving Beijing strategic leverage even as it privately questions Moscow's conduct of the war.

Turning to Europe, Sir Laurie argued that the rules-based order that shaped the post-Cold War world no longer anchors global politics. The transatlantic relationship is entering a period of uncertainty, US engagement in European security is becoming less reliable and long standing questions of unequal burden sharing have become acute and risk dividing allies. This environment will push Europe to expand its defense capacity. Loss of trust in US-centered alliances may increase incentives for nuclear proliferation among middle powers.

On negotiations, he argued that a just, lasting ceasefire is possible but unlikely in the near term. Putin seeks capitulation rather than settlement and territory alone will not resolve a conflict driven by political and strategic aims. Any pause in fighting will require security guarantees that deter future Russian aggression based on facts on the ground rather than Russian promises. Moreover, reconstruction costs will fall heavily on Europe and sanctions relief must remain conditional and fully reversible.

In discussion with the audience, Sir Laurie argued that NATO membership for Ukraine remains improbable because the alliance will not reach consensus and Putin will never acquiesce. Security guarantees will only be credible if they are underwritten by a long-term defense posture for Ukraine built around deterrence and sustained capability.

Sir Laurie closed by cautioning against the West seeking to humiliate Russia rather than ensuring it fails in its military and political objectives in Ukraine. Russia must emerge from the war strategically weakened, but efforts to destabilize the Russian state itself carry heavy risks. The central challenge for Europe, he argued, is to maintain deterrence, strengthen capacity and prepare for a prolonged period in which the underlying conflict with Russia continues even if the fighting stops. The underlying conflict with Russia will not be resolved until Russia fundamentally changes; this will not happen under Putin.

---

hosted by Professor Sergey Radchenko


Sir Laurie Bristow is the tenth President of Hughes Hall at the University of Cambridge, and the sixteenth head of the College since its foundation in 1885.

Sir Laurie has been a British diplomat. He joined the United Kingdom diplomatic service in 1990, as the Cold War ended and change swept across Europe. His first overseas posting was to Romania in the spring of 1992, where he worked for three years during the post-communist transition.

Sir Laurie served as Ambassador for the United Kingdom three times. He was Ambassador to Afghanistan during the fall of the Republic to the Taliban in August 2021 and the UK's subsequent evacuation of over 15,000 people from Kabul airport. He was the UK's Ambassador to Russia from 2016 to 2020 and Deputy Ambassador to Russia from 2007 to 2010. He was Ambassador to Azerbaijan from 2004 to 2007.

In 2020, Sir Laurie worked on the COP 26 climate change conference as Regional Ambassador for China, Eastern Europe and Central Asia, the Middle East and North Africa. His other senior roles in London included Director for Eastern Europe and Central Asia and Director for National Security. He was knighted in 2019 for services to British foreign policy.

Sir Laurie regularly writes and gives talks about Russia and a broad range of national and international security issues. He is a Distinguished Fellow of the Royal United Services Institute and a Senior Associate Fellow of the European Leadership Network.

Sir Laurie went to a state school and was the first person in his family to go to university. He read English at Trinity College, Cambridge, and completed a PhD on Ezra Pound, the American poet. He is also a keen amateur musician.