Sexy Hermit, a problem with Joe Biden is that popular sentiment drives so much of his foreign policy. It did with Afghanistan and continues to be the case with China (our relationship with China being considerably more important to our security and prosperity than Russia).
Biden calling for Regime change is not helpful and doesn't make it happen. Putin would would only use it in his own propaganda and it also stokes fears in other countries of America the bogeyman all over again. This tactic, done by Trump contributed to our failure in Meduro's Venezuela.
Many thanks.