WASHINGTON  - Russia’s non-intervention stance on Syria remained unchanged on Saturday as G8 leaders looked to hammer out a joint declaration to put greater pressure on President Bashar al-Assad’s regime.“There cannot be any change of regime through force,” the Kremlin’s Africa envoy, Mikhail Margelov said, adding that G8 leaders meeting at Camp David had yet to agree on the Syria part of their final summit declaration.“One has to give an opportunity to the Syrians to sort out their affairs themselves,” Margelov told reporters in Washington.“You cannot use an ax to shear your way through the Syrian crisis, you have to use a pair of pincers to somehow sort it out.”Despite refusing to budge from their principle of non-intervention on Sayria — a thorn in the side of Western efforts to stop Assad’s year-long crackdown on dissent — the Russian envoy was critical of the regime, saying it had not come up with “any really creative ideas” to resolve the crisis.A long-standing ally of Damascus, Moscow drew international criticism for vetoing two UN Security Council resolutions against Assad.The Kremlin, which cautions against intervention in domestic affairs of conflict-ridden countries like Syria and Libya, is at odds with the rest of the G8 , which also includes Britain, Canada, France, Germany, Italy, Japan, and the United States.US President Barack Obama said Saturday world powers were “hopeful” about talks with Iran next week on its nuclear program, as the Islamic Republic comes under tightening sanctions.Obama, hosting the G8 summit at Camp David, struck an unusually upbeat note on the talks in Baghdad, emphasising that world powers agreed on how to tackle the crisis, in an implicit contrast to Iran’s deepening isolation.“We’re unified when it comes to our approach with Iran,” Obama said, surrounded by leaders of the Group of Eight rich nations club in his Laurel Lodge cabin at the wooded presidential retreat in Maryland.The US leader, facing a delicate diplomatic balancing act on Iran as he runs for reelection, also warned that Iran’s inability so far to convince the world its nuclear program was peaceful was “of grave concern to all of us.”He said all the leaders agreed that Iran had the right to a peaceful nuclear program, if it complied to international rules and were “hopeful” about the talks in Baghdad.Washington says it is committed to a peaceful resolution to the nuclear crisis, but has warned that all options, including possible military action, are on the table.Obama said world powers would do all they could to promote the Myanmar’s political reforms.Obama lifted some investment restrictions on the nominally civilian-ruled nation this week, hoping to reward President Thein Sein for taking steps toward political change, and to encourage the government to go further.He said at the G8 summit at his Camp David retreat that fellow leaders “are hopeful” about developments in impoverished Myanmar, formerly known as Burma.“Our hope is that this process will continue and we’re going to do everything we can to encourage that process.”