At least 80 Syrian soldiers were killed by rebels over the weekend in clashes and attacks on security forces checkpoints, an activist group says. Rebels told the Syrian Observatory for Human Rights that more than 100 soldiers had died in the suburbs of Damascus and Idlib province. The Observatory said it had confirmed the names of 80 dead with local medics. Meanwhile, the European Council's president has said the EU and Russia must combine their efforts on Syria. After a summit in St Petersburg with President Vladimir Putin, Herman Van Rompuy admitted they had "divergent assessments" of the situation. But both sides agreed the peace plan negotiated by the UN and Arab League envoy, Kofi Annan, was the best way to "break the cycle of violence in Syria, avoiding a civil war", Mr Van Rompuy added. "We need to combine our efforts in order for this to happen, and to find common messages on which we agree. We need to work towards an immediate stop of all forms of violence in Syria."