How Sweden and Finland change Baltic reinforcement

How would Swedish and Finnish NATO membership change the problem of resupplying the Baltic states?

It would create a more viable northern route through Norway and Sweden while increasing the need to defend that route and NATO's northern flank.

During the 2022 accession process, bringing Sweden and Finland into NATO would change Baltic reinforcement. Supplies could move through Norway toward the Swedish coast and then onward to the Baltic states instead of relying on a single exposed approach. That would make the route more viable and turn Norway and the northern transit network into infrastructure that must be defended. The Royal Marines would need a real brigade-scale northern-flank mission rather than a token deterrent presence.