Azerbaijan will need investment and long-term purchase commitments if it is to double its natural gas supply to the European Union, Azerbaijan’s deputy foreign minister Elnur Mammadov told the Financial Times in an interview published on Thursday. “Whoever is interested in investing, whether it’s public or private, they [must] put their money on the table in order for us to be able to increase their capacities,” Mammadov told FT. “I wouldn’t say that there is a disagreement [with the EU],” the Azeri…