That was a near-earth orbit ASAT shot (865km away), the Ku sats are in geo-stationary (35,000km away). To shoot down a geo-stationary you would need to perform a Hohmann Transfer Orbit ...
A Hohmann trajectory is the minimum energy path needed to attain a higher orbit. It's not the necessary path.
... that would give the defending satellite about 1/2 a days' notice that it's coming. You then just manoeuvre the satellite after the ASAT missile is on its way and it misses by miles.
Only if the target satellite can maneuver, and the anti-satellite device cannot. And only if the operators of the target satellite know that something is coming.
By the way, most ASAT missions will commit fraticide of one's own capability as well. Also, if you go for an exo-atmospheric nuke then it would probably quickly escalate to about 20-30 minutes of "exchanges" and then the Cockroaches would inherit the Earth. 
Neither the USA nor its likely opponents in space would have to use nukes to attack each other's orbital platforms.
ASAT against anything above LEO just isn't a viable tactic in my opinion without risking all-out war.
You think that shooting down an opponent's low Earth orbit satellites would merit only a diplomatic protest, or what?