China relationship is strained for many reasons, Ukraine and their general support for Russia conducting the war is just icing on the cake. This has strained Chinese relations with multiple countries though (UK, EU members, etc.).
India I’m not seeing much in the way of change. The US at least didn’t really do anything different with India buying Russian oil.
US relations with South American companies are variable and generally slightly negative based on what I’ve seen, but I’m not really sure how they have gotten worse. What is leading you to believe that they are?
Saudi Arabia I somewhat agree with but think Middle East politics are extremely complex. Wouldn’t read much into Chinese efforts there.
On the other hand, the US has shored up massive support from all of Europe ex Belarus, Japan, South Korea, Canada, and Australia at a minimum. Finland joins NATO tomorrow.
Overall I’d say the war has been a large boost to American foreign relations on the whole. Can’t please everyone anyway.
W.r.t cost -> everybody is spending money. Russia especially.