I know about private sector/NGO donations (eg by the Gates Foundation) to China, which apparently the State Department had coordinated. I do not know if the Chinese like Jack Ma or Chinese Red Cross have reciprocated enough.
The ambiguity is about the US government's aid (the 'cupboard' thing that was discussed upthread.) The State Department claimed they were preparing to send up to $100m worth of aid (2/7-20). The China government claimed (3/20) they have never received any. Trump never blasted the China for denying it. So the CUPBOARD thing likely never happened.
On the other hand, Washington Post reported there were 1.5 million expired N95 masks sitting in an Indiana warehouse., and the California Governor claims 170 ventilators sent from Trump administration were 'not working.' I have a feeling these are not the only such incidents, and so government oversight is probably why the cupboard is empty. Whether Obama or Trump should take the blame is another story.
I hope Indiana recognizes they can use those expired masks. A friend of mine at the fire department brought me some of the expired masks because they weren't going to use them. In turn I gave all my masks to my DIL to take to the hospital she works at.
The expired masks have deteriorated straps, but the mask part is okay. Just a little tricky to use but not impossible.