Amps China was already importing most of its gas from elsewhere, mainly Australia and Turkmenistan… see here:
https://www.eia.gov/todayinenergy/detail.php?id=52258
anyway 1) I don’t think a China has storage to build a big inventory (of gas) and 2) there will be limited gas transport capability from Russia to China… so, no, I don’t think it was China behind prices going up… it was simply Russia curtailing supply to Europe.. prices are a lot lower in Asia and the US than Europe, reflecting the fact it’s largely a European/Russian issue.