It is widely reported that drones attributed to Ukraine attacked a wealthy suburb of Moscow earlier today. There was some property damage and a few injuries. Of course Russian drones have been attacking Kiev off and on for over a year.
The U.S. has been scrupulous in demanding Ukraine not attack Russia with arms supplied by us. There is nothing stopping Ukraine from using weapon systems it has developed and built to undertake such attacks, something it obviously wants to do.
Russia calls these attacks "terrorist activity." I am of the opinion Russian attacks on Ukraine are of a similar nature, either both are terrorism or neither is.
Russia is a bully and much smaller Ukraine is a victim trying hard, and with some success, to fight back. I favor the underdog.