ANALYSIS-Russia gas crisis highlights Europe's green energy storage problem

* War in Ukraine spurs drive to move away from Russian gas * Green energy companies devising solutions to boost storage * But financing and political will to invest in short supply By Umberto Bacchi June 10 (Thomson Reuters Foundation) - From dropping weights down old mine shafts to pumping compressed air into caves, companies are racing to develop inventive new solutions to store renewable energy as European nations try to move away from Russian fossil fuels.

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