(CNN) -- Heavy shelling hit the Syrian city of Hama on Monday, opposition activists said, days after the U.N. Security Council voted to send as many as 300 observers to monitor a tenuous cease-fire.
At least 80 people were killed Monday in Syria, 50 of them in Hama and 21 in Idlib, according the Local Coordination Committees of Syria, a network of opposition activists. Dozens of people were also wounded in Hama, which was visited Sunday by international observers, the group said.
Elsewhere in the city, security forces opened fire to disperse a demonstration, the Local Coordination Committees said.
Explosions also rocked the devastated city of Homs early Monday, shaking the neighborhoods of Baba Amr and Inshaat.
International pressure on Damascus has been mounting. European Union foreign ministers agreed to ban the export of goods and technology that might be used by Damascus to produce chemical or biological weapons. Also banned was the export of luxury goods to Syria, according to a news release issued Monday by Britain's Foreign Secretary William Hague.
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The U.N. Security Council voted unanimously Saturday to authorize up to 300 unarmed military monitors to try to bring the Syria government into compliance with a cease-fire imposed this month.
Though they agreed on the observer mission, Russia and China, two permanent countries on the 15-member council, have quashed attempts to take tougher action against the Syrian regime.
U.N. Russian Ambassador Vitaly Churkin spoke to Christiane Amanpour, CNN's chief international correspondent, on Monday about his country's position.
"As a matter of principle, we believe that the U.N. Security Council is not about regime change. We believe that ... if there is crisis in a country, the role of the international community should be to help the parties involved to find a political, peaceful way out of this crisis," he said.
"And when we saw some of the resolutions, which included sanctions, we knew that those were resolutions, which were heading in the direction of regime change by force, which would, in turn, lead only to much more bloodshed in Syria."
Churkin stressed a need to stop the violence and establish a political process.