Consequences of a Ukrainian No-Fly Zone

Some says this would lead to World War III, while others say Russia would never escalate to nuclear weapons due to a no-fly zone. Who is right?

Many said Russia would never attack Ukraine and it was all just posturing. Personally, I believe Putin kept the prospect of an attack on the table but that his real hope was that amassing his troops on the border would pressure NATO and Ukraine to give into his demands. Too many people did not take his threats seriously and so…