With Russia's blitz in Ukraine failing, I'm not sure if it's particularly clever to openly announce arming Ukraine and imposing restrictions on SWIFT by Russian banks.
In the past Russia had stated this would be interpreted as an act of war.
Do they honestly believe that Putin rather loses face (and probably lead to his demise in domestic politics) than use his nuclear arsenal?
To me this looks like it'll be escalating quickly to the use of a 'tactical' nuke by Russia somewhere in Ukraine, unless planned negotiations between Russia and Ukraine will be succesfull.