NOVOAZOVSK, Ukraine -- Ukrainian security council spokesman Col. Andriy Lysenko says Ukrainian forces were fired at using Grad missile systems from Russian territory at about 11 a.m.
Lysenko says about an hour and a half later, two columns, including tanks and other fighting vehicles began an attack.
They later entered Ukraine from Veselo-Voznesenka and Maximovo of the Rostov region in Russia.
Ukrainian border guards retreated because they didn't have heavy equipment.
Official: 2 tank columns from Russia enter Ukraine
A Ukraine security spokesman says two columns of tanks from Russia have entered a strategic town.
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