Security & Defence 

Security & Defence 

The security landscape in Europe has fundamentally changed in recent years. Shifting geopolitical realities and accelerated technological development are creating both new opportunities and new challenges for security and defence operators.

Companies in this field must navigate a highly regulated and rapidly evolving environment. They face increasingly complex compliance requirements, heightened scrutiny around investments and ownership, and growing expectations around ethics and responsible business conduct.

Legal advisor to the security and defence sectors

Castrén & Snellman provides top-tier legal services to domestic and international clients operating in the security and defence industries. Our deep industry knowledge helps clients anticipate legal risks and seize strategic opportunities in a changing world.

We advise both private and public sector organisations across the full corporate lifecycle, from early-stage funding and cross-border structuring to strategic partnerships and regulatory risk management.

Our clients include defence sector authorities, defence tech developers, dual-use manufacturers, critical infrastructure operators, public authorities, institutional investors, banks and venture capital and private equity funds. Many are driving innovation in areas such as space, cybersecurity, AI, connectivity and sustainable technologies.

As the go-to supplier of legal services, we advise security and defence operators, as well as their business partners, on matters such as:

Castrén & Snellman is a trusted legal partner in matters where national security, regulation and geopolitical complexity intersect. Our legal advice helps safeguard operational continuity, promote responsible growth, and support the strategic resilience of the security and defence ecosystem.

Latest references

We advised an international bank syndicate in a EUR 300 million revolving credit facility (RCF) for ICEYE, the world leader in sovereign intelligence from space. The bank-syndicate comprised Nordic and global banks, with Citi and Danske Bank acting as Joint Global Coordinators and Mandated Lead Arrangers. The RCF will support the issuance of guarantees for customer contracts, enable continued business growth, and serve as a liquidity backstop. 
Case published 21.5.2026
We advised the NATO Innovation Fund as lead investor on Kelluu’s EUR 15 million Series A funding round, with participation from Keen Venture Partners, Gungnir Capital, and Tesi. Kelluu is a Finnish deep tech company operating the world’s largest autonomous airship fleet. We advised NIF on this transaction alongside global law firm Latham & Watkins.
Case published 17.4.2026
We advised General Catalyst as lead investor on ICEYE’s EUR 150 million series E funding round, valuing the company at EUR 2.4 billion. ICEYE is the world leader in synthetic aperture radar (SAR) satellite systems and operates the largest SAR constellation globally. Its technology delivers objective, near real-time Earth observation in any weather or light conditions, enabling governments and institutions to manage risks and respond faster. General Catalyst is a global investment and transformation company, partnering with leading entrepreneurs to build toward global resiliency and applied AI. Its portfolio includes companies such as Airbnb, Snap, Stripe, Mistral AI, Hubspot, Anduril, Helsing and Legora. We advised General Catalyst on this transaction in collaboration with the US law firm Goodwin. 
Case published 8.12.2025
We advised Springvest Oyj in organising a EUR 45 million Series A funding round for ReOrbit, a space technology company and a leading provider of software-first satellites. It’s the largest all-equity Series A round in Finland and one of the most significant deals overall in the European space and defence sector. The purpose of the funding round is to support ReOrbit’s growth. The round consisted of a private placement reserved for professional and institutional investors, which included, e.g. Icebreaker.vc, Expansion VC, 10xFounders, Inventure VC, Varma Mutual Pension Insurance Company, and Elo Mutual Pension Insurance Company, and an EUR 8 million public share offering, which was oversubscribed within 4.5 hours. Springvest is a Finland-based investment firm that connects unlisted growth companies with investors. ReOrbit builds sovereign satellites and connected systems for national security.
Case published 9.9.2025