Serghei Ostaf

Senior Fellow

Moldova

Black Sea

Romania

Ukraine

Russia

Defense and Security

Geopolitics

Serghei Ostaf is a Senior Fellow at Delphi Global Research Center. He is known in the fields of security and democratization for his instrumental contributions to fostering security, democratization, and upholding human rights in Eastern European countries. With an exceptional focus on promoting democratic values, Ostaf has co-authored influential guidelines on freedom of peaceful assembly and collaborated on key assessments of assembly and policing policies in several countries. His expertise extends to constitutional matters, where he has authored insightful publications on the consolidation of parliamentary systems, regional conflict dynamics, international humanitarian law, implications for war-related matters, and state obligations. With an unwavering commitment to advancing security and democratization, Ostaf offers invaluable expertise and strategic perspectives to any discussion or event in the region.

Crimea and the Dniester: From Foundation to Action

This is part IV of four-part series on historical perspectives on Crimea and the Dniester: What 120 contemporary factors and 2,500 years of historical evidence imply about combined deprivation.

5/26/2026

Crimea and the Dniester: Four Scenario Narratives to 2035

This is part III of four-part series on historical perspectives on Crimea and the Dniester: What 120 contemporary factors and 2,500 years of historical evidence imply about combined deprivation.

5/26/2026

Crimea and the Dniester Region: The Reconfigured World, 2025–2075

This is part II of four-part series on historical perspectives on Crimea and the Dniester. Geoeconomic, demographic, corridor, and technology vectors — and what they mean for the deprivation thesis.

5/20/2026

Crimea and the Dniester Region: A Single Historical System

This is part I of four-part series on historical perspectives on Crimea and the Dniester. What 2,500 years of evidence tells us about combined deprivation.

5/11/2026

From “Frozen Conflict” to Strategic Asset: Transnistria as Part of Russia’s Pressure Point Strategy against the West

Transnistria represents not a frozen conflict but a weaponized platform demonstrating Russia's strategic innovation: achieving exhaustion-based victory through patient accumulation of positional advantages that, when activated synchronously, overwhelm Western consensus-based security structures without triggering decisive response.

9/20/2025

Russia’s Western Aggression Pathways: Baltic or Danube Corridor?

The brief assesses Russia’s strategic options for continued westward aggression, concluding that the Danube Mouth axis represents the most rewarding, probable, and operationally realistic path. Since 2022, the US has strengthened its security posture in Romania, recognizing the region's strategic vulnerability, while the EU maintains its conflict-averse posture, emphasizing negotiation over deterrence

7/28/2025