BRUSSELS The European Union's top diplomat Kaja Kallas said Monday that Russia was "gambling with war ", after a spate of Russian drones and military jets crossing into the bloc's airspace. NATO has boosted its defenses along its eastern borders as it accused Moscow of testing the alliance's air defenses with drone incursions into several members and by flying military jets in Estonian airspace. "Every time a Russian drone or plane violates our airspace, there is a risk of escalation,