A weekend massacre of more than 100 people emerged as a potential turning point in the Syrian crisis Monday, galvanizing even staunch ally Russia to take an unusually hard line against President Bashar Assad's government, according to AP. Analysts said Russia may be warning Assad that he needs to change course or lose Moscow's support, which has been a key layer of protection for the Syrian government during the uprising that began in March 2011. Russia has grown increasingly critical of Damascus in recent months, but Foreign Minister Sergey Lavrov's latest comments were unusually strong when he put the blame for 15 months of carnage primarily on Assad's government. "The government bears the main responsibility for what is going on," Lavrov said in Moscow following a meeting with British Foreign Secretary William Hague. "Any government in any country bears responsibility for the security of its citizens." Alexei Malashenko, a Middle East expert with the Carnegie Moscow Center, said Lavrov's comments suggest Russia may be backing away from its long-standing support for Damascus. "Bashar Assad is driving himself and Russia into a corner," Malashenko said. "Bashar has definitely gotten the sense that he may lose Russia's sympathy, and he may step back a bit." Activists from the area said the army pounded the villages with artillery and clashed with local fighters. They said pro-government gunmen later stormed the area, doing the bulk of the killing by gunning down men in the streets and stabbing women and children in their homes.