> Helium is very expensive currently because of Russia
I'm aware of the ultimate reasons for those sanctions, but it seems weird in this narrow context to say it's "because of Russia". No, it's expensive because of the EU, which decided to make it expensive, unilaterally.
1. https://ec.europa.eu/commission/presscorner/detail/en/qanda_...
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.
> Technically it expensive because demand exceed supply.
> with the war that source was cut off
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.