The nations meeting in earthquake-devastated L'Aquila are also likely to consider what actions to take on Iran, North Korea.
As North Korea cargo ship returns home, US and UN officials claim a victory for tighter sanctions.
From arms control to Afghanistan, analysts say the deals brokered by Obama and Medvedev could profoundly reshape global security.
North Koreans on Thursday tested several short-range missiles, but their track record on longer-range missile technology has been poor.
Thursday’s tests were expected; what’s at issue now is whether Pyongyang will send a long-range missile toward Hawaii on July 4.
The move aims to counter Western depictions of the country as a fast and loose post-communist frontier. Gambling operators say the state is pushing the industry underground – and losing $1 billion in tax revenues.
An Iranian company is the first to be penalized as the US uses stricter financial sanctions to curb Pyongyang's weapons program.