Really complicates the question of RUssian nukes where will I run? ...Hell were is it going to land?
The likely first strategic targets in USA would be
-- Washington DC
-- Omaha, Nebraska
-- Colorado Springs, Colorado
-- Cheyenne, Wyoming
-- Minot, North Dakota
-- Bluemont, VA
I would expect a surface nuclear bomb attack with a functional yield of 20 MT, whether it is one 20 MT, or multiple 855 KT, etc.
(This has been the standard strategic "nuclear bomb" size of USSR for decades in terms of destruction goals. I would not mix engineering with USSR military mind; the goal of destruction IMO is likely to be the same, regardless of blast(s) yield.)
I would expect fallout contour to go from west to east and south to north, with 1000 Rads/Hour of 230 miles (371 kilometers, and 100 Rads/Hour of 372 miles (599 kilometers).
Of course, fallout contour could likely also follow any wind pattern, with fallout contour directly just east, just north, just south, or just west. West least likely. Wind probablility below.
This is pretty common in the northern hemisphere.

I respect the jingoism of those in USA who advocate that the Russia nuclear threat is not real, how they will blow up on their platforms, how they are incompetent, etc.
Really respect, understand, and God knows hope all of that would be true.
But the idea that USSR/Russia enemy chose to ignore its greatest strength ignores the Russian/Soviet military strategic thinking and goals regarding the world.
Simply because it does not have an economy of the scale of the USA. Clearly this ignores the actual history of the past 100 years.
In other (non-nuclear) circumstances, I would quietly appreciate the "USA USA USA" toned analysis.
But my greater concern is for the lives of fellow Americans, to save as many lives as possible from nuclear war.
And denial that it could happen simply does not further that cause in my opinion.