The article from Forbes includes links for its claims. Click those links.
From the Forbes article:
Gazprom announced that it will instead ship gas previously transiting Ukraine to the Greek-Turkish border via a Black-Sea underwater pipeline. Gazproms CEO brushed off European objections that it has no infrastructure to handle such shipments, stating that We have informed our European partners, and now it is up to them to put in place the necessary infrastructure starting from the Turkish-Greek border. In other words, Europe must undertake a massive infrastructure investment to replace a well-functioning transmission system, just for Putins convenience.
The word stating is a link for the source of this claim. Click the word stating. It goes to the article:
It is talking about the South Stream pipeline, not yet built, that is not proposed to be routed to Turkey.
No pipelines exist to handle the volumes they are talking about.
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Do you honestly believe that 4 days ago, Russia cut off most of the Natural Gas to Europe and NONE of the mainstream media even mention it in passing? No articles? I’ve seen several blogger types pick it up, but a first I’ve seen from someone like Forbes.
You are confusing background links as citations to the source of the story.
There are existing pipelines to Turkey that can handle the volumes, none of them link to these affected countries.
So you could say there is zero capacity to get the gas to the destination right now except by LNG ships and rail.