Do not panic. Russia is simply trying to restore the Soviet Union. In some sense Putin is doing what Lincoln did to the southern states that seceded. He wanted them back in the Union and the price was 600,000 Americans lives.
America should not get involved because we are too weak to do anything more than stumble around wasting money and lives. All the former Soviet satellite states should be concerned as it is unlikely that Russia will be satisfied with just taking over Ukraine.
Guerrilla warfare is the route the Ukrainians should take. Kill the Russians in their sleep, in restaurants, in their cars and in their homes. Do it long enough and they will leave. See Afghanistan who defeated both Russia (20 years) and the United States (10 years) using these tactics.
Russia is counting on the will of the Ukrainians to be broken rather than fighting a protracted guerilla war. If their will is broken the Ukrainians will get what they deserve. (Sort of like what is happening in the U.S. with the Socialist/Fascist/Atheist left in control - we are getting what we deserve).
Pray that the Ukrainian people will fight and die for their values and principles. There is no glory in whimpering away into oblivion.
P.S. I am having a wonderful birthday because my Hope is in Christ Jesus and so for me to live is Christ and to die is gain. I trust you are in the same state of Peace.