回複：申請Schengen (申根) 簽證, 被要求提供回美簽證

I have the same problem. You have to go to Canada or Mexico to get a returning entrance visa. But you may be rejected. It is the same as you apply a new visa from China. It's better not to risk if you want to be back USA.

Finaally, then you can apply Europe visa.

Good luck