I would interpret that as an act of war.
Most of us would, the current President of the United States, would not.
I would interpret that as an act of war.
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Yup. We might have to write them a letter or something.
Before you go to war, you should be able to prove that the enemy did the attack. How do you prove this one? Circumstantial evidence of Russky subs nearby isn't really proof enough.
Now when our comsats get taken out, it'll be obvious who fired off the ASATs.