LETTRE: "In the interests of time, I'll briefly note the Department of Defense’s views on cyber in three core themes. First, the threats we must address. Second, what we are doing to address them now. And third, the difficult but urgent work we know still lies ahead. First the threats. As you know, the Department of Defense’s leadership believes we confront no fewer than five immediate but also distinct and evolving challenges across all operating domains. We are countering the prospect of Russian aggression and coercion, especially in Europe, something we unfortunately have had to energetically renew our focus on in the last several years."