Dropdown (with onChange) with custom taxonomies

I have multi-select taxonomy field A. When one or more values are selected in A, I want to restrict the choices available in taxonomy field B.

So for example:

Two Taxonomies called

country – “USA”, “Russia”, “China”

city – “Chicago”, “Moscow”, “Beijing”

I want when user in taxonomy “country” choose value “USA” after that in taxonomy “city” show only “chicago”.

Is it possible? And how can I do this using a JavaScript or jquery

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