Four nations-Ukraine, the Republic of Ireland, Iceland, and Japan-officially joined NATO's Cooperative Cyber Defense Center of Excellence (CCDCOE). The new members will contribute to addressing cyber threats and enhancing cybersecurity collectively, with Ukraine's membership holding added significance due to its ongoing conflict with Russia.

The CCDCOE, now celebrating its 15th anniversary, was established following cyberattacks on Estonia after the relocation of a war memorial. These attacks prompted NATO's research into cyberwarfare, resulting in the creation of the CCDCOE and the Tallinn Manual. CCDCOE is an accredited international military organisation with over 30 NATO members and participation from other democratic countries.