tb_40054a-deRussian fighter jets along the country’s western border have been put on combat alert as tensions mount over fears that Moscow is preparing to intervene militarily to protect its interests in Ukraine.  “Constant air patrols are being carried out by fighter jets in the border regions,” Interfax quoted a ministry statement as saying. “From the moment they received the signal to be on high alert, the air force in the western military region left for the … air bases.” The news arrives just a day after the United States warned Russia it would be a “grave mistake” to conduct any kind of military intervention in Ukraine following Moscow’s announcement yesterday that a snap drill involving 150,000 troops would take place in western Russia. Meanwhile, Ukraine’s interim government has also warned Russia against making military movements in Crimea after armed men seized control of government and parliament buildings in the region. Earlier this week, pro-Russia citizens installed a Russian Mayor in the town of Sevastopol as part of a growing backlash against the western-backed coup. More