The US has successfully taken down two intercontinental ballistic missiles in testing. Some analysts believe that one of the reasons Russia invaded Ukraine is because the US now has this capability (I'm not so sure about that though). China and Russia have both accused the US of undermining their nuclear capabilities with this new technology. I propose the US develope this military technology and install the apparatuses that facilitate the capability to take down intercontinental ballistic missiles in Eastern European countries, but at a price.
Beyond that, the US could install nuclear power plants and alternative energy sources to rid these countries of their reliance on foreign oil (specifically Russian oil). I bet Taiwan would be willing to pay a good price for US defensive services. Poland would love this idea.
I wonder if it would be a good idea for the US to develop defensive military technologies and sell them to foreign countries who would be willing to pay for it. Even with nuclear weapons India feels threatened by China. I propose the US only sell defensive technologies to these countries instead of offensive technologies. We could even begin a military cybertech service for these countries. There certainly is a market for this service, and our economy is a service based economy now, so it would be cutting-edge. It seems like a good way to help ease, or even eliminate the national debt (you know, that thing that nobody talks about anymore).