Putin and his thugs need a taste of their own bitter medicine.
Absolutely yes, they now have war inside their boundaries, the first reporters to be in were Italians and they sent wide coverage of a Russian war zone with ruins, prisoners and civilian refugees. That was the fruit of a very careful evaluation and absolute secrecy. The area had nearly no troops and the Ukrainians met almost no resistance. This is a huge psychological victory for Ukraine.
It won't be easy to maintain position and revenge by the furious Putin will be certain but now the Russians will be reluctant to send all troops into the Donbass territory, leaving the borders unprotected.