Telling others to STHU accomplishes nothing. Like it or not, Putin is a world leader. You may hate this, but it is the reality. Trump does realise this and as in his previous presidency he extends his hand and ear to listening to the adversary. Trump is a true diplomat and peacemaker.
Telling Putin to STHU was for his benefit
Ok, let him talk more ... make him look even dumber than he already does!
And then warns them very strongly of consequences for stupid actions