Welcome to a vocabulary lesson.
“Bar nothing” means that Russia will use any means to retain Control.
The only way Russia will surrender Crimea is if all of their arsenal is exhausted and they can’t come out on top.
This means that diplomacy is window dressing at best and a humiliating display of international masturbatory at worst. Every one who has paid attention knows that to court removal of Crimea is to flirt with a war that has every likelihood of extending to NBC if Russia is pressed, since there is zero chance that they will back down.
“Welcome to a vocabulary lesson.”
It is yourself who needs the vocabulary test, because the gross and massive violations of international law can and often does have grave consequences for the aggressor, sooner or later as discovered by such criminals as Hitler, Goering, Ribbentrop, Saddam Hussein, and others. The people of Russia need to take immediate heed of those potential consequences and terminate the careers of their leaders engaging in these crimes before Russia and its people suffer the consequences of their aggressions and victimization of the rest of the world.
In the past, even the most criminal leaders of the Soviet Union recognized the risks they were taking and eliminated their leader/s when they got too far out of control. Stalin was apparently assassinated by Beria and others when Stalin appeared ready to purge them in preparation for engaging the Western Allies in a nuclear war for control of Europe.