Russia's finance ministry has raised its estimate of this year's budget deficit to 2.12 trillion roubles ($23.76 billion) or 1.1% of gross domestic product, from 1.595 trillion roubles or 0.9% of GDP, it said on Monday. ($1 = 89.2275 roubles) (Reporting by Darya Korsunskaya, Writing by Olzhas Auyezov, Editing by Timothy Heritage)