A blockade is an act of war...
There is no blockade. Russia is free to supply Kaliningrad by sea and air.
I see.
So if someone blockade all sea traffic to the USA< you would not consider that a blockade since the USA can still be supplied by planes.
Or if someone blockade all plane traffic to the USA, you would not consider that a blockade since the USA could still be supplied by sea.
That is NOT how the word blockade has been used throughout history...