Harvard Belfer Center
Harvard Kennedy School research centre on security, diplomacy, and nuclear risk.
Last refreshed: 1 June 2026 · Appears in 1 active topic
Is Russia's territorial collapse in Ukraine a genuine reversal or a temporary pause before a new offensive?
Timeline for Harvard Belfer Center
Russia loses 100 sq miles in four weeks
Russia-Ukraine War 2026Mentioned in: ISW Logs Third Straight Net-Loss Week for Russia
Russia-Ukraine War 2026Mentioned in: Grossi: a deal without IAEA is illusion
Iran Conflict 2026Mentioned in: Pakistan relays Trump's terms to Tehran
Iran Conflict 2026Compiled and published territorial analysis
Russia-Ukraine War 2026: Russia loses net ground for first time- What is the Harvard Belfer Center?
- The Harvard Belfer Center for Science and International Affairs is Harvard Kennedy School’s flagship research centre, founded in 1973. It produces policy analysis on nuclear security, geopolitical risk, and international diplomacy, used by governments worldwide.Source: Belfer Center
- What did the Harvard Belfer Center find about Russian territorial losses in Ukraine?
- Belfer’s Russia Matters project found Russia lost a net 33 square miles between 17 February and 17 March 2026, the first sustained Ukrainian net gain since the 2023 counteroffensive, with Russia’s advance rate decelerating fivefold since mid-2025.Source: Russia Matters / ISW
- What is Russia Matters?
- Russia Matters is a project run by the Harvard Belfer Center that tracks and analyses Russian foreign and military policy, including regular territorial assessments of the Ukraine conflict drawing on Institute for the Study of War data.Source: Russia Matters
- How does the Harvard Belfer Center differ from the Institute for the Study of War?
- ISW produces real-time daily battlefield maps; the Belfer Center’s Russia Matters project aggregates and contextualises ISW data for longer-term strategic and policy analysis, translating battlefield trends into assessments for policymakers.Source: Russia Matters / ISW
- How much territory did Russia lose in Ukraine in May 2026?
- Russia net-lost 38 square miles in the week of 19-26 May 2026 alone, bringing the four-week total from 28 April to 26 May to 100 square miles, the largest sustained Ukrainian territorial recovery since the 2023 counteroffensive, according to Harvard Belfer Center analysis of ISW data.Source: event
- What is the Harvard Belfer Center's Russia Matters project?
- Russia Matters is a Belfer Center project that tracks the Ukraine conflict using ISW territorial data and other sources. It has been cited for producing the most systematic open-source territorial analysis of Russian advance and retreat rates, updated weekly.Source: event
- How has Russia's advance rate changed since 2025?
- Russia's net advance rate for January-May 2026 stood at 104 sq km, compared with 1,619 sq km in the same period of 2025. The advance rate had decelerated fivefold from mid-2025 to February 2026, and by late May 2026 had gone into net reverse across four consecutive weeks.Source: event
Background
The Harvard Belfer Center for Science and International Affairs is the flagship research centre of Harvard Kennedy School, founded in 1973. Based in Cambridge, Massachusetts, it focuses on nuclear security, geopolitical risk, and international diplomacy.
Its Russia Matters project tracks the Ukraine conflict and became a key source when its analysis of Institute for the Study of War (ISW) data revealed Russia had lost a net 33 square miles between 17 February and 17 March 2026: the first sustained Ukrainian net territorial gain since the 2023 counteroffensive. Russia's advance rate had decelerated fivefold since mid-2025, to 33-50 sq km per week by February 2026. By late May 2026, Russia Matters data showed the trend had accelerated sharply: Russia net-lost 100 square miles over the four weeks from 28 April to 26 May 2026, including a single-week loss of 38 square miles in the week of 19-26 May, the largest single-week Russian territorial loss of the year. Russia's net advance rate for January-May 2026 stood at only 104 sq km against 1,619 sq km in the same period of 2025.
The Centre's territorial tracking frames a central strategic question: whether Russia's mounting losses represent genuine reversal or a temporary pause. With Secretary General Rutte publicly characterising Ukraine as 'stabilising the frontline' on 21 May, the Belfer data has become a benchmark for policymakers weighing Ceasefire timing and Western support thresholds.
