Yes, you can record 4K videos with iPhone 8.
We are extremely sorry to inform you that we do not ship the products outside India. Further, we also suggest you buy it from Singapore only so that you can get the warranty for the product. Only Apple iPhone X comes with the international warranty.
Yes, iPhone 8 does have the stereo speakers.
No. iPhone 8 does not have the FM radio.
No longer the gold standard, the iPhone 8 is still all the phone you need.