Earlier quoted context omitted.
It is very important for national stability. A highly-interconnected global economy is arguably better at securing international stability.
That was the main argument for global trade already in 1914. France was Germany's most important commercial partner, and vice-versa. All German rifles had stocks made from French walnut wood! All French locomotives had German-made tubing! This stupid mantra was repeated ad nauseam after 1991, too, with silly op-eds from Friedman and friends about how two countries with McDonald joints in both can't be at war and simi…
Without those sanctions, it is quite conceivable that a troubled war effort would not be nearly so much of a problem, but because of the trade dependency Russia feels quite threatened by the consequences of war. Not enough to have prevented it in the first place, but they overreaced.