[belorn]

Technically it expensive because demand exceed supply. Russia was just one of the larger producer, as it is a by product from natural gas extraction, so with the war that source was cut off.

In combination, US military decided to sell a large portion of their stored helium to a single private firm around the same time, rather then sell it off in smaller chunks, and that seems to also have decreased the global supply.

As a semi-new idea people are experimenting with hydrogen as a replacement for helium, which could become much cheaper and renewable compared to helium. Time will tell how bad idea it is to mix high pressure, oxygen and hydrogen while under water.

[avar]

    > Technically it expensive because demand exceed supply.

How prices are determined in general isn't relevant to your claim that something is "very expensive currently because of X".

    > with the war that source was cut off

What war was going on in August 2024 that wasn't going on in September and October 2024?

I don't see why you're insisting on this passive and inaccurate description.

Someone unfamiliar with this might infer that Russia considered Helium a strategic asset and forbade its export, when the reality is that to the extent that your initial claim is in any way relevant to Helium prices, it's the other way around: The EU forbade the import of Russian helium.