Doesn't really mean anything if the materials aren't local to the region. People in bronze age scandinavia were trading for copper with the mediterranean so there was a "global" trade network already in place.
Sorry to make a minor point, but while the goods scandinavian and mediterranean goods travelled that far, doesn't mean the people did.
Perhaps more likely, each was traded a dozen times with someone 50km away, and the goods reached people the manufacturer had no idea existed.
I don't know the actual history / archaeology, or quantities involved.
Europe does have a remarkably good inland navigable river network.
There's mention here that Scandinavians raided Mediterranian coastal towns and villages:
https://www.realmofhistory.com/2016/05/17/cypriot-copper-axe...
This map suggests a possible eastern route (the accompanying web page makes no mention of Sweden, scandinavia, or the Baltics):
http://theancientneareast.com/wp-content/uploads/2014/08/Tra...
(from: http://theancientneareast.com/the-bronze-age-world-system/)
Travel along the Donau, Dneiper, or Don rivers could have reached the Black Sea:
https://www.worldatlas.com/webimage/countrys/euriv.gif
This article and map suggest sea routes, through the Straits of Gibraltar:
https://www.speroforum.com/a/ROURBRXIJL49/77965-Ancient-trad...
Some things never change: https://www.steelavailable.com/en/counterfeit-steel-big-worr...