...this, after Trump's alleged phone call to Putin. .
...his escalation, even bigger bombing of civilian targets invited Biden's decision for action; there are many reasons for this greater permission (including politics). Ukraine, is, now on better footing, vis-a-vis the fighting forces against them; it doesn't matter how many ATACMS they will get, in effect it is the threat that they present to those in Command of the military bases in their firing zone. Putin it seems has been greatly disturbed, comparing their importance to his willingness, in return to use WMD's; but we have heard and seen this response from him many times before.
"the missiles will speak for themselves.", says Zelenskyy.
Never mind the missiles, they are now suppling mines which is against international law. And of course needless to say Russia and America are two countries which have not signed up to it.