It has been announced.
We have committed ourselves to No-first-use. I think it is a bad idea. If you’ve ever been an elder brother/sister, you will know why. If you develop a reputation for maturity and rational behaviour, you’ll be the one expected to make concessions every time there is a crisis, because the other side is so childish and immature that it is impossible to reason with it.
We shouldn’t rule out any kind of behaviour, because that increases our predictability and restricts the number of chips on the table when we are bargaining.