The difference between the various degrees of stealth is such that what we're really doing in the Arctic is letting them know that we know they are there and that we want them to turn around, so stealth is not as critical in that context. I know what you're saying; you never know where the attack might come from, but it's not an invisible plane. It's a question of being able to sneak up on people, and what we want in the Arctic is for the Russians to know we are coming, and to know that we know they are there.
On December 4th, 2014. See this statement in context.