On 30 August 2008, the Libyan leader Muammar Gaddafi and Italian Prime Minister Berlusconi signed a historic cooperation treaty in Benghazi. Under its terms, Italy would pay $5 billion to Libya as compensation for its former military occupation. In exchange, Libya would take measures to combat illegal immigration coming from its shores and boost investment in Italian companies. The treaty was ratified by the Italian government on 6 February 2009, and by Libya on 2 March, during a visit to Tripoli by Berlusconi. In June Gaddafi made his first visit to Rome, where he met Prime Minister Berlusconi, Italian President of the Republic Giorgio Napolitano and Senate's Speaker Renato Schifani.