NATO Names New Assistant Secretary General for Defence Policy and Planning (nato.int)

• Nick Catsaras assumed role of NATO Assistant Secretary General for Defence Policy and Planning in September 2025.
• He was previously Deputy National Security Adviser to UK PM Starmer and negotiated UK-Ukraine security agreements.
• His responsibilities include force planning, posture, and nuclear policy within the Alliance.

"Nick Catsaras, former Deputy National Security Adviser to UK Prime Minister Keir Starmer, has been appointed NATO Assistant Secretary General for Defence Policy and Planning as of September 2025. He will oversee capability planning, posture, and nuclear issues. Catsaras previously negotiated the 2024 UK-Ukraine security pact and the 2025 100-Year Partnership Treaty."