Syria and Iran on Saturday condemned the U.S.'s recent decision to provide aid to the Syrian opposition.
"I do not understand how the United States can give support to groups that kill the Syrian people," Syrian Foreign Minister Walid al-Moualem said.
"This is nothing but a double-standard policy ... One who seeks a political solution does not punish the Syrian people."
On Thursday, Washington announced for the first time that they would give non-lethal aid - such as medical supplies, food and $60 million for security, education and sanitation - to the opposition, saying it would bolster support for the rebels.
Iran believes the aid will simply prolong the conflict.
"If you really feel sorry about the ongoing situation in Syria you should force the opposition to sit at the negotiation table with the Syrian government and put an end to bloodshed," said Ali Akbar Salehi, Iran's foreign minister.