(ANSA-AFP) - MOSCOW, JUN 1 - Russia said Thursday it had used jets and artillery to thwart an attempt by Ukrainian troops to "invade" its southwestern Belgorod region. "At about 3:00 am (0000 GMT), Ukrainian units comprising up to two motorised infantry companies, reinforced with tanks, attempted to invade," the Russian defence ministry said. Moscow used jets and artillery to repel the attacks and prevent Ukrainian troops from crossing over into Russia, the ministry added. (ANSA-AFP).