Second things: we have already achieved nuclear fusion in France and UK and perhaps other researches I do not know but from there to arrive to a positive sustainable heat production and in turn to arrive at industrial scale the road is super long only technically leaving apart any political and business consideration.
Third and last thing: actual fission based nuclear power is useful to produce plutonium so usable and powerful nuke, and anyone like the idea of having many of them in it's arsenal. With fusion we only produce heat. Usable for many things, mostly to produce steam and so electricity and even to heat cities in the winter. But with little use for military purpose.
Long story short: I think even if someone know and can produce a working fusion-powered electrical plant no government will let seriously develop it, at least for next few decades...