How to say in Czech: How good is their Russian?

English
How good is
Czech
Jak dobře umějí rusky?
Their Russian is getting better.
Their Russian is very good.
How do you say that in Russian?
I do not speak Russian very well.
You speak Russian very well.
Their native language is Russian.
Are they learning Russian on their own?
He is learning Russian.
He is not Russian.
He is Russian.

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