The madman will most likely be some isolated small entity. Yes it can do some damage but will be wiped out of the face of the Earth by the rest of the world. A

The madman will most likely be some isolated small entity. Yes it can do some damage but will be wiped out of the face of the Earth by the rest of the world. As for massive, world ending attack - hopefully over the time all those treaties, agreements and monitoring that were in place before this attack on Ukraine will be restored over the time and improved.