"He has also stated that countries that export armaments to China should be sanctioned and violators should be punished

Bernie supports an arms embargo against China that includes:

Denying participation in cooperative research and development

Prohibiting ownership and control of any business registered as a manufacturer or exporter of defense articles or services

Revoking all licenses relative to dual-use goods or technology

Prohibiting participation in any foreign military sales"

https://feelthebern.org/bernie-sanders-on-china/

He's said nothing on the American presence surrounding China