LONDON (Reuters) – Russia’s central bank announced on Tuesday a series of steps to help financial market players such as private pension funds and management companies cope with the current “crisis situation,” including relaxing some regulations. Russia’s financial markets have been thrown into turmoil by severe economic sanctions over its invasion of Ukraine. The central bank has more than doubled its key interest rate to 20% and provided extra liquidity to banks, and the government has rolled out some support measures, but the rouble has tanked and securities like bonds have sold off heavily…