Ukraine: 2 tank columns from Russia enter Ukraine

NOVOAZOVSK, Ukraine (AP) - Two columns of Russian tanks and military vehicles fired Grad missiles at a border post in southeastern Ukraine, then rolled into the country today as Ukraine's overmatched border guards fled, a top Ukrainian official said. The comments by Col. Andriy Lysenko, a spokesman for Ukraine's National Security Council, and other statements from NATO, the pro-Russian separatists in Ukraine and the United States left no doubt that the Russian military had invaded southeastern Ukraine.