Ukraine attacked Russia proper (not just Crimea) before. We all remember Mi-24 over Belgorod but there were also Tochkas fired against airbases (IIRC Taganrog a

Ukraine attacked Russia proper (not just Crimea) before. We all remember Mi-24 over Belgorod but there were also Tochkas fired against airbases (IIRC Taganrog and Milerovo). I don't think red lines exist. Maybe for using western supplied munitions.