Britain must defend itself - but don't panic: Russia's military is decrepit, our Navy is shrinking, and we are no longer a great power. Let's spend wisely, not give in to hysteria, says Peter Hitchens. We need to be strongly defended. I've been saying so for years, particularly pointing out the way that our navy has been shrivelling away and our army has evaporated. That doesn't mean we should rearm in a panic or persuade ourselves that we face dangers that we don't. Who is the enemy? We're