Most of that money has been spend in the US and to replace old stocks of munition. I also guess that European countries (who have contributed together even more when including civilian support) are buying a lot of weapons from the US. The war also has shown that certain types of weapons are superior, the best kind of advertisement you can get, probably leading to additional sales of those weapons systems.
Next, Ukraine is not waste land, but an important source of grain that is feeding large parts of the world. If those would come under control of Russia, it would lead to a lot of political influence. Russia (and China) are already getting more and more control over countries in Africa. The greatest growth of population and wealth is taking place in Africa at the moment. If those markets are lost to the East it will have a negative impact on the economy of the US.
There must also a reason why the US is dragging this war on. The US in the past year has been very slow to deliver certain weapons systems (such as the F-16) and putting restrictions on the use of certain weapons systems (such as the restriction that military targets further away than 100 km (60 miles) from the border of Ukraine may not be hit). Although the F-16 is delivered by a coalition of European countries, the US had to give an export permit, and the US also has delayed the training of Ukrainian pilots. All these delays have permitted Russia to gain win on the battle field.
There are even people who believe that the US government does not want Ukraine to win, because the war is causing so much damage to the economy of Russia.
Next, Ukraine is not waste land, but an important source of grain that is feeding large parts of the world. If those would come under control of Russia, it would lead to a lot of political influence. Russia (and China) are already getting more and more control over countries in Africa. The greatest growth of population and wealth is taking place in Africa at the moment. If those markets are lost to the East it will have a negative impact on the economy of the US.
There must also a reason why the US is dragging this war on. The US in the past year has been very slow to deliver certain weapons systems (such as the F-16) and putting restrictions on the use of certain weapons systems (such as the restriction that military targets further away than 100 km (60 miles) from the border of Ukraine may not be hit). Although the F-16 is delivered by a coalition of European countries, the US had to give an export permit, and the US also has delayed the training of Ukrainian pilots. All these delays have permitted Russia to gain win on the battle field.
There are even people who believe that the US government does not want Ukraine to win, because the war is causing so much damage to the economy of Russia.