# Finland joins NATO as its 31st member

Date: 2023

Finland became NATO's 31st member on 4 April 2023, ending decades of military non-alignment after Russia's full-scale invasion of Ukraine. President Sauli Niinisto confirmed the membership acts and decided on accession after parliamentary approval in March 2023; Foreign Minister [Pekka Haavisto](/people/pekka-haavisto) deposited Finland's instrument of accession at NATO Headquarters. Supporters frame the move as strengthening deterrence and regional stability, while critics argue NATO enlargement raises tensions with Russia; the long-term security effect remains contested.

## People

- Sauli Niinistö: https://factrail.ai/people/sec-sauli-niinisto
- Joe Biden: https://factrail.ai/people/joe-biden
- Recep Tayyip Erdoğan: https://factrail.ai/people/recep-tayyip-erdogan

## Drivers

- Armed-Conflict Intensity: https://factrail.ai/drivers/sec-armed-conflict-intensity
- Energy Security: https://factrail.ai/drivers/energy-security
- NATO Deterrence Capacity: https://factrail.ai/drivers/nato-deterrence-capacity
- Democratic Resilience: https://factrail.ai/drivers/democratic-resilience

## Sources

- https://www.reuters.com/world/europe/finland-joins-nato-historic-shift-caused-by-russias-ukraine-war-2023-04-04/
- https://www.presidentti.fi/niinisto/en/news/the-president-of-the-republic-of-finland-decides-on-finlands-accession-to-nato/
- https://www.nato.int/cps/en/natohq/news_213448.htm

## Methodology

https://factrail.ai/methodology

Canonical: https://factrail.ai/facts/sec-fact-finland-nato-2023