These are not the same as attending a foreign university full time to earn your degree.
My .02 cents for this whole thing, it depends on what university you attend as to whether you can find a TT job in the US when you finish. Oxford, Cambridge, sure no problem, they are considered at least equal to the Ivy League in the US. Even to a lesser extent, St. Andrews, Sorbonne, Heidelburg, Bologne, are ok, people have hard of them at least. Charles University in Prague, despite it being one of the oldest universities in Europe, good luck getting a TT job in the US. That is not to say you won't get an excellent education in another country, you will. Its just that the US academic job market sucks and if the hiring committee hasn't heard of your university, they aren't going to take you seriously.