It is "perfectly reasonable" for Ukraine to strike targets deep inside Russia, in part to "degrade" Russia's military, says Richard Dannatt, a former head of the British Army. In an interview with RFE/RL's Georgian Service, Dannatt also says that given the slow pace of Ukraine's counteroffensive, Kyiv and its Western partners should prepare for a likely protracted conflict.
I’d say it also depends on if the police open fire on the other force when they get near then their official roll goes out the window they chose to get involved