BRUSSELS ― The EU is to game out how it would respond if one of its countries was attacked. In the first operation of its kind, chief diplomat Kaja Kallas is to oversee what's called a "tabletop" exercise next month to establish how the bloc's mutual assistance clause, Article 42.7 , would work in practice, a senior EU official said. The plan is to test the bloc's political rather than military response. "We'll follow up with an exercise with the [defense] ministers [after] to see how this