President Biden today:

“I wasn’t then nor am I now articulating a policy change. I was expressing moral outrage that I felt and I make no apologies.  “[I am] not walking anything back." Asked whether the remark would spur a negative response from Putin, Biden said: “I don’t care what he thinks ... He’s going to do what he’s going to do." 

You see, Dmitry Peskov? We don't care what your master thinks. Carry on and don't be calm.