IBM and Shell are among the latest Western companies to halt their activities in Russia on Tuesday, as Moscow’s invasion of Ukraine continues to intensify. IBM has suspended its entire business in Russia, group CEO Arvind Krishna said late on Monday. Meanwhile Japanese firms including Toyota, Nissan, Subaru and Mitsubishi Motors are withdrawing their staff from Russia, the Nikkei business newspaper reported. British energy company Shell said it would discontinue all spot purchases of Russian crude oil and shut all of its fuel, service stations and all operations related to aviation fuel, and l…