One has to take the declarations of "first studying the situation" with great cynism. It's not like the emergence of this situation wasn't to be expected, and it strains credulity that the foreign ministries didn't have well-prepared scenarios. I think these declarations are meant to play for time.

i.e. Czechs not recognising it but kinda-coyly hiding their opposition behind that "it's up to the EU" feint

I don't know. Even if from the same party, the President and the government aren't the same thing. It may be that Klaus is paranoid about a re-emergence of the Sudeten-German question, or even the appearance of Moravian separatism out of thin air, while the government is just being bashful in its Atlanticism.

Slovakia: ... Slightly more coldly-formal version of the Czech statement??

In Slovakia's case, I think diplomatic language is only meant to leave wiggle room. The nationalist-dominated Slovakian government's concern is a break-away of ethnic-Hungarian-majority areas in the South of the country.

_{*Lunatic*, n.
One whose delusions are out of fashion.}