BRUSSELS Russia is posing an existential threat to the European Union's security and the only way to address that is to increase spending on defense, EU foreign policy chief Kaja Kallas said on Wednesday, adding that the EU had for too long offered Russia alternatives. "Russia poses an existential threat to our security today, tomorrow and for as long as we underinvest in our defense," she said during a speech at the annual conference of the European Defense Agency (EDA). "People say I'm a '