USA will not be able to play this card for long. Trump already expressed doubts about whether USA would defend eastern EU countries. Trust is almost gone alread

USA will not be able to play this card for long. Trump already expressed doubts about whether USA would defend eastern EU countries. Trust is almost gone already, so USA is losing "benefits" what to offer to allies quite fast. What would be the point to sell products to USA with huge tariff on top of it to the point that local products would be way cheaper? Nobody would buy it. What's the point to expect partnerships in military with USA when for example South Korea is left cold without any discussions about it?