The United Nations Security Council will hold an emergency meeting at noon Eastern time to discuss Ukraine at the behest of Russia, according to press reports. Russia wants to discuss the "serious escalation of violence in Ukraine," according to AFP. This would be the security council's 13th meeting on Ukraine since the start of the crisis. On Friday, Ukraine launched a military operation to regain control of the pro-Russian separatist stronghold of Slovyansk.Stocks in US and Europe have lost all their gains and now sliding on this news.