How to say in Czech: Do they speak Russian?

English
Do speak
Czech
Mluví rusky?
They do not speak Russian.
They do not speak Russian very well.
They speak only a little Russian.
They speak Russian.
They speak Russian fluently.
They speak Russian very well.
Does anybody here speak Russian?
Where did they learn Russian?
Are they learning Russian?
Are they learning Russian on their own?

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