March 15 (SeeNews) - Bulgaria launched a procedure for selecting a strategic investor in a project for construction of a second nuclear power plant in the country; Serbia invited binding bids for booking of capacity for transit of natural gas via a planned section of the TurkStream pipeline that will connect Bulgaria and Hungary; and Raiffeisen Bank International said it is considering acquisitions in strategically relevant markets, including Bulgaria, Romania and Serbia: these were some of the most interesting developments in Southeast Europe over the past week.