Which would mean that it could hit any Chinese company within days and companies from other nations within weeks/months. I doubt the US government will put a ban on South Korean manufacturers but I'm not sure if Samsung wants to take that risk.
Currently, but the US has already chastised South Korea for not spending enough on its defense as it relates to the US. South Korea capitulated I believe, but there remains the possibility that in South Korea's goal of being on agreeable terms with North Korea, it could have negative ramifications on the US/SK relationship.
I don't think it is highly likely it'll play out like that, but if I'm Samsung, I'm either throwing resources into Tizen or forking AOSP into a tailored version of the OS.
Obviously, the views of China vs SK are different in the US right now. Who is to say what the future holds if South Korea tries to make stronger ties with North Korea (considering NK blames the US for their current stalemate)? I'd argue that Samsung probably wants to have a contingency for things that are outside of their control, but yeah, out of wack thinking.
Apologies for my tone. However, I find your assertions pretty flagrant and not any basis in reality. South Korea has been a US ally for 50+ years. Samsung is even the top mobile OEM in US. I don't understand why suddenly Samsung now needs to build another OS because of US threats. This is so unfathomable to me that it is coming out in the caustic remarks I typed above.