Imagine that Russia had annexed half of Alaska, was fighting the US for control of the other half, and was talking about its historical connections to much of the US pacific coast down to Fort Ross, California: https://en.wikipedia.org/wiki/Fort_Ross,_California

If someone proposed to the US that all US citizens could get Russian and Spanish citizenship, would the US response be to ignore this; to laugh at this; or to be angry that this was suggested, followed by "oh god send guns, the Russians I can see them! Why won't you help us, you signed a treaty to guarantee our borders that's the only reason we agreed to give up our nukes!"