MILAN/ROME, July 6 : Italian defence group Leonardo is preparing to increase its stake in the company that manages cloud services for Italy's public administration by acquiring an additional 10 per cent from state-owned IT company Sogei, sources told Reuters.Leonardo, which already owns 25 per cent of the so-called National Strategic Hub (PSN), would raise its stake to 35 per cent in a deal that could be announced by the end of this month, two sources familiar with the matter said.PSN is central to Italy's cloud migration programme backed by about €2 billion ($2.3 billion) from the European Union's post-pandemic Recovery Fund, which aims to move sensitive public sector data and services on to secure cloud infrastructure.Sogei carried its stake in the cloud venture at just €7 million on its