Russia and the Democratic People's Republic of Korea's Treaty on Comprehensive Strategic Partnership provides for mutual military assistance in case of armed aggression against either of the allies, the document cited by the Korean state news agency KCNA indicated.

"In the event that one of the parties comes under an armed attack by any state or several states and thus finds itself in a state of war, the other party will immediately provide military and other assistance by all means at its disposal under Article 51 of the UN Charter and in accordance with the laws of North Korea and Russia," Article 4 of the treaty read.

The third article of the indefinite treaty, which was signed on Wednesday by Russian President Vladimir Putin and DPRK leader Kim Jong Un, states that in the event of an "immediate threat" of armed aggression, the allies would immediately activate bilateral communication channels to coordinate positions and agree on "practical measures" required to deal with the threat.

The fifth article stipulates that each party "undertakes not to enter into agreements with third states directed against the sovereignty, security, territorial inviolability, right to free choice and development of political, social, economic and cultural systems and other key interests of the other party, as well as not to participate in such activities."

During his visit to the DPRK, Putin indicated on Wednesday that Moscow and Pyongyang have vowed to support each other against foreign aggression. He described the treaty he signed with Kim as "truly a breakthrough."

The Russian leader pointed out that the document "provides, among other things, for mutual aid in case of aggression against one of the participants," affirming that Moscow supports Pyongyang’s right to protect its security and sovereignty from potential Western aggression.

He also attributed the rising tensions in the region to the actions of the US and its allies.

In response, Tokyo and Seoul expressed concern about the agreement between Russia and the DPRK, claiming it violates the UN Security Council's resolutions.

However, Russian Deputy Foreign Minister Sergey Ryabkov insisted on Wednesday that Moscow's ties with Pyongyang were in line with international rules.