Cub is all over the place. Some of the larger ones are rebadged Kioti. I know the Mahindra 15 series Mitsu's used to be sold as Cubs too, and I think Cub might have one Mitsu still in ntheir lineup (not sure about that). Some of the new Cub sub-CUTS are mfg in the U.S. with Korean engines (Diahatsu I think. But again, not sure).
I am certain that none of the Cubs are made in China, though.
I don't think any of the major brands are rebadging Chinese tractors to sell in the States. A few are rebadging Chinese tractors for sale in foriegn (primarily third world) markets, but they won't find their way here until the overall quality comes up a bit.
I do believe we'll see the day, but not for a few years.