Biden doesn't run his mouth when he shouldn't, but foreign policy with China and along the southern border are essentially the same as under Trump, and the Afghanistan withdrawal alienated some NATO allies. Biden is carrying over more of Trump's policies than you'd expect.
The most depressing thing is that it likely wouldn't have changed much. Congress (of which Bernie is still part of and has been for decades) is the one with the power to make these changes, the President is just the scapegoat/hero.
