Local residents who live near the airport just outside Donetsk take shelter in a basement. This comes as Ukraine's military said Monday it pulled its forces back from defending the airport -- the latest in a string of reverses for Ukrainian forces fighting pro-Russian separatists.<br /> <br />At a military academy in Kiev, Ukrainian President Petro Poroshenko says Russia's direct involvement in Kiev's war against the separatists had tipped the balance on the battlefield.<br /> <br />(SOUNDBITE) (Ukrainian) UKRAINIAN PRESIDENT, PETRO POROSHENKO, SAYING:<br /> <br />"Direct and open aggression has been launched against Ukraine from a neighboring state. This has changed the situation in the zone of conflict in a radical way and raises new and more difficult questions for our security bodies."<br /> <br />In turn, Russian President Vladimir Putin is pointing the finger at Kiev's leadership for refusing to enter into direct political talks with the separatists.<br /> <br />Putin also says he hopes "common sense" would
