Australia and China actually(Type I). After looking into it further, it seems that China also uses a type A and C, so it could be type A without a wider neutral pin like we have in the US. I'm not sure if this means an R1 with Type A plug wouldn't fit snugly in a US outlet. I guess we'll have to wait to find out.
http://www.stayonline.com/reference-international-plugs.aspxif you scroll down you'll see that the common chinese 2P is exremely similar to the north american NEMA 5-15, with the difference being a fraction of a millimeter dimensions-wise.
The China GB1002 and GB2099 standard 2 pin 15 amp non-grounded appear to be physically identical to the NEMA 1-15 found in North America. In many cases a North American plug will mate with China receptacles without an adapter. However, the China standard holds to tighter dimensional measurements than those in North America. This means that in some cases North American plugs will not quite fit into China receptacles.
tldr; chinese 2P is slightly smaller, and will fit most north american outlets, possibly with a bit of wiggleroom (so be sure it wont slip out of the outlet)