NEW : Syrian opposition reaches out to international powers . The United Nations Security Council is expected to meet on Monday in an emergency session after Russia and China vetoed a draft resolution that would have condemned the use of chemical weapons by President Bashar Assad's regime. The Syrian National Council wants U.N. and Arab League action . It says nearly 250 civilians died over a two-day period .
NEW : Syrian opposition reaches out to international powers . The United Nations estimates that about 5,000 people have died in Syrian violence this year . The Syrian National Council wants U.N. and Arab League action . It says nearly 250 civilians died over a two-day period .