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Zamir Nicholas Catsaras
Assistant Secretary General - Defence Policy and Planning
03 September 2025 - Present
03 September 2025 - Present
Nick is NATO's ASG of Defence Policy and Planning as of 3 September 2025, having previously been Deputy National Security Adviser to UK Prime Minister Keir Starmer. He is responsible for the Alliance's capability and force planning, posture, plans, and a range of defence policy questions, including nuclear issues.
Nick began his career in 1995 as an officer in the British Army before joining the UK diplomatic service in 2001, working on the 2002 NATO Prague Summit. He was posted to Budapest before becoming private secretary to the UK’s Minister for Europe and then private secretary for foreign and defence affairs to Prime Minister Gordon Brown between 2008 and 2010. Nick was a deputy director in the UK Cabinet Office for Prime Minister David Cameron from 2010 to 2012, including during the Libya crisis.
Nick left the UK civil service for seven years, working as a partner at a consulting company, before returning in 2019 as head of the security policy department in the FCDO. He was principal private secretary to Foreign Secretary Dominic Raab then Liz Truss, before becoming director general for Russia-Ukraine in the UK Cabinet Office in January 2023, initially for Prime Minister Rishi Sunak and then for Prime Minister Starmer, negotiating the 2024 UK-Ukraine bilateral security cooperation agreement and 2025 UK-Ukraine 100-Year Partnership Treaty. Nick combined that role with the deputy national security adviser position from September 2024.