I know that Trump is an idiot and his first inclination would be to attack Russia....but do you know why Biden (and NATO) haven't attacked Russia? Because doing so without the exactly appropriate response leads to World War III and the possible annihilation of all life on earth. It sucks that Ukraine is being invaded but personally, I don't want to see American troops dying in Ukraine and I don't want to see things escalate because we have a bad leader in place.
Trump has a child's mentality when it comes to foreign relations and the actual mechanics of how the world works. For all of the tough talk about Trump, China became more bold when Trump was President and continued to expand their sphere of influence in Asia. Kim Jong Un played Trump like a fiddle and continued to do whatever he wanted. NATO's stature was diminished because of Trump's actions. Now....to be fair...Trump did force a conversation on balance and responsibility that needed to be had, but in typical Trump fashion, he did it in the most dickish and childish way possible. There is a real argument that Putin's actions are a result of Trump convincing him that NATO was weak and ineffective and that the US values money over principle and would allow him to take Ukraine without real resistance. If Trump really was so persuasive and compelling to Putin, why couldn't he convince Russia to pull out of Crimea?
If you really want to think about what's going on, there have been some fascinating articles that discuss the balance of power in Europe over the past 70 years. After WWII, the US and its allies realized that they were pivoting into an ideological battle with a communist opponent that had conscripted a huge army and no qualms about sacrificing millions of lives to further their purpose. The only leverage that we had at that time was the fact that we had nukes and the Russians didn't. Over the next 25-30 years, the tactical paradigm shifted and the Soviet Union had enough nukes that both the US and Soviet Union agreed to the "MAD" principal to discourage the countries from entering into a conflict that would escalate. One of the key components of that agreement was that both countries agreed not to develop defensive weapons to upset the balance.
As you will recall, Reagan upset that in the 80's with his "Star Wars" initiative. Whether by accident or plan, the resulting military buildup bankrupted the Soviet Union and led to it's collapse.....unfortunately leaving Russia in possession of a lot of nukes and a bitter KGB agent named Vladimir Putin. Since World War II, the US has committed to reducing and/or eliminating its stockpiles of chemical, biological and tactical nuclear weapons. Russia has not worked as hard in that regard and now, they have significant stockpiles of those weapons compared to the US, which combined with the sophistication and power of the US military, has essentially flipped the script that was in place at the end of WWII. We can't bring our military into play against Russia without placing the world in danger of triggering events that could escalate into the end of life as we know it.....just like the Russians were forced into playing nice at the end of WWII.
It's easy to grandstand and say, "the GOP would have done this or that" but just like China and North Korea, it's all a bunch of talk and BS and nothing changes until outside forces come into play that force change. This is a fragile time in human history and I am grateful that the Cheeto isn't the one making decisions. I may not agree with everything Biden does (or much of it) but I do not want a narcissistic, arrogant blowhard who loves dictators to be the one making decisions of such a critical nature. Thank God for that.
Rant over