@Powerfromspace1 Mariupol had one before the Russian escalation in 2022. It was a global level supplier. Combined with the supply chain breakdown down Russian ore, that destruction was initially going to produce a shortage of helium.
Whilst the Mariupol plant hasn't been replaced I'm pretty confident global demand hasn't dropped either therefore other companies must have expanded to fill the gap. After all, a gas does expand to fill the shape of its container.