Syrian government troops and insurgents continue to fight in several parts of the country to strengthen their positions on the eve of a ceasefire.

The Free Syrian Army wrote to the United States on Sunday about the deal it agreed on with Russia. The forces said they would "cooperate positively" with the ceasefire, but were concerned it would benefit the Syrian government.

The letter also mentioned how the agreement neglected besieged areas, and called for aid to be taken to all such places without exception.