"As to our action - as the president has emphasized it will be based on Article 51 of UN Charter. The article envisages the right of individual or collective self-defense for any state in case of an attack against it," Lavrov said, APA reported citing TASS.
"The act of terror over Sinai was an attack against Russian nationals, which is equivalent to an attack against the state. The right to self-defense will be exercised through all available means - political, military, security services, intelligence and so on," he added.