NATO countries strongly condemn the decisions of the leaders of Russia and the Democratic People's Republic of Korea (DPRK) to dangerously expand Russia's unprovoked war of aggression against Ukraine, according to a statement on the NATO website.

"In addition to the DPRK’s already substantive support to Russia’s war effort, through the provision of millions of rounds of ammunitions and ballistic missiles, the thousands of combat troops deployed by the DPRK constitutes a dangerous expansion of its ongoing support for Russia’s illegal war of aggression against Ukraine," according to the statement.

NATO said deepening military cooperation between Russia and the DPRK has a profound impact on Euro-Atlantic security and also has implications for the Indo-Pacific region.

The countries also pointed out that the strengthening of military cooperation between Russia and the DPRK violates numerous UN Security Council resolutions, including 2270 (2016), 1718 (2006), and 1874 (2009).

"This is particularly egregious given Russia’s status as a Permanent Member of the UN Security Council. We call on Russia to return to compliance with these resolutions and to uphold its international obligations," according to the statement.

It was also noted that Russia's September 26 statement that the denuclearization of the DPRK is "off the table" is unacceptable, as it undermines the global non-proliferation regime, directly contradicts relevant UN Security Council resolutions, and further exacerbates regional tensions.

"The Russian statement forms part of its wider effort to undermine the global non-proliferation regime and to dismantle UN sanctions. We urge all countries not to provide any kind of assistance to Russia's aggression, and condemn all those who are facilitating and thereby prolonging Russia’s illegal war against Ukraine," according to the statement.

NATO assured that it will continue to work with its partners, in particular in the Indo-Pacific region, to promote peace and stability and to prevent Russia and those who facilitate its military efforts from undermining regional and global stability.

The alliance said "allies remain as resolute as ever in supporting Ukraine for as long as it takes for Ukraine to prevail."

"Allies and partners continue to step up vital political, military, financial, economic, and humanitarian assistance as Ukraine exercises its inherent right to self-defence as enshrined in Article 51 of the UN Charter. Allies are determined to support Ukraine in building a force capable of defeating Russian aggression, in line with the pledge of long-term security assistance for Ukraine," according to the statement, which was joined by Australia, Japan, New Zealand, the Republic of Korea and Ukraine.