The only way to know if it's uranium glass is to check it with a UV torch.
Not aware of Chinese uranium glass.
Photos 2 and 3 (more importantly) don't blow up much bigger when mouse-overed. But from what I can see, on the base alone, Id say it's looking Chinese, or possibly Romanian. But I'd like a closer look at the centre (pontil) as I really can't see it that well.