However, despite #Ukraine's incursion into the #Kursk region, this situation has not yet led to a nuclear escalation.

The question of where exactly #Russia's "red lines" are drawn remains open. But the risk that this episode could be interpreted as crossing a "red line" in the future remains.

During the first #Cold_War, nuclear escalation was the subject of intense study. Theorists of the time, such as #Thomas_Schelling and #John_Nash, developed sophisticated models and