On missile defense, If I am correct there are point defense systems that can protect a specific target but not that could protect an entire country. Hypersonic missiles move so fast they can't be shot down by conventional missiles. A hypersonic missile is moving significantly faster than the bullets from something like a phalanx Gatling gun. The only defense against something going this fast once it goes into its hypersonic descent is a laser, which may or may not be operational at this time. Russia also has nuke-tipped cruise missiles that can follow the terrain. That means the missile comes in at near-supersonic speeds at 20 feet off the ground. That's nearly impossible to shoot down.
The media is trying to make Ukraine such a victim that public opinion pushes us into the conflict. This is just plain stupid. First of all, NATO is a defense pact, there is no authority to enter a conflict when a member nation is not under attack. I think this is why the media is playing up the nuke power plant attack. Russia fired on the security building, not directly on the critical plant stuff. Further, if they are trying to take the country, did we think they wouldn't go after the largest Nuke plant in Europe? But the propaganda over a melt-down and fallout makes a credible threat to the rest of Europe - so NATO can act under its charter.
The bottom line is Ukraine is where it is because they were completely unprotected. I think there are going to be a lot of NATO applications coming in! Note also that we didn't add Ukraine because we didn't want to be automatically drawn into a direct conflict with Russia. Russia has been fighting former USSR member nations for years and Russia has been very aggressive. So this is not a new war, it's an escalation of one that the world has sat back and let happen for a long time. It was a mistake to go into Ukraine, but it's easy to see how Putin made it.
Letting this conflict widen is the dumbest thing you could possibly do as a leader. The killing would be on a scale never seen before. The sanctions are going to impact Putin and this whole mess has been flipped to where it is threatening Putin's own political survival. Unfortunately, that's not going to help Ukraine.