Russia's foreign minister has condemned talk of arming the Syrian opposition, saying it is illegal under international law.
Russia's Sergei Lavrov spoke Wednesday in London following a meeting with British Foreign Secretary William Hague.
Britain and some other countries have talked of lifting a European Union arms embargo to allow weapons to be sent to opposition forces.
Late last month, the United States announced $60 million in extra aid to the Syrian opposition and, for the first time, non-lethal aid to rebel forces.
In the past, Russia has sold weapons to the government of Syrian President Bashar al-Assad.