Yeah, you don't discuss war planning over an insecure phone. The OP talked about "in this situation", so no, you don't do that. And at least one member of that

Yeah, you don't discuss war planning over an insecure phone. The OP talked about "in this situation", so no, you don't do that. And at least one member of that Signal chat was in Russia. When you are one or two steps away from the President, you should be even more careful.