By Tassilo Hummel and Tom Sims PARIS/FRANKFURT (Reuters) – Societe Generale on Thursday warned of the possibility that Russia could strip the bank of its local operations, in one of the starkest warnings yet from a Western company about the potential impact of the war in Ukraine. The French bank, whose $20 billion exposure to Russia is one of the largest among foreign lenders, said it was working to reduce risks in the country, as European banks review business there amid escalating tit-for-tat sanctions with the West. “The group has more than enough buffer to absorb the consequences of a pote…