Mutual DEFENSE is perfectly legitimate and discourages rogue nations from attacking others in wars of conquest and aggression.
But, The nations involved in a defense pact must not provoke another nation -- not only must they not strike first but they must not intentionally engage in behavior that would make any reasonable nation want to do a first strike on them, fearing for its own safety.
Urging the west not to “lie to yourself and others” and “choke in the paroxysms of Russophobia”, Medvedev said such a conflict “always has the risk of turning into a full-fledged nuclear war” and that this would be “catastrophic for everyone”.
“We want to defend our freedom and our equality,” Tuppurainen said. “This is not only about territories and borders. This war is also about values and ideology.”
Russia would view the move as a violation of international legal obligations, the Russian Foreign Ministry said.
"Russia will be forced to take retaliatory steps, both of military and other nature, in order to curtail the threats that arise to its national security in this regard,” the Russian Foreign Ministry said in a statement.
Finland said on Thursday it would apply to join NATO "without delay", with Sweden expected to follow, as Russia's invasion of Ukraine looked set to bring about the very expansion of the Western military alliance that Vladimir Putin aimed to prevent.