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So what's the difference between what NASA does, what Chinese did with Em drive and what Russians have orbiting in Yubileiny satellite?

More interesting question: can I make one at home? I can do magnetic levitation, both pushing and pulling with high-frequency electromagnets; it would be cool if I could do this as well and having floating objects in my home 8-)

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"it would be cool if I could do this as well and having floating objects in my home"

The reported thrust of the device is in the tens of micronewtons. Assuming it weighs 1 kg, you would need approximately a million times more thrust for the device to levitate (i.e. counteract its own weight) at the surface of the earth.

But in space a few micronewtons per Kg is pretty usable.

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