The Americans have threatened to retaliate against this retaliation, raising the risk of a genuine trade war over steel.
The world community responds predictably: diplomacy, sanctions, supporting the internal dissent in the terrorist "safe haven" countries, eventually ordering special military units to deploy and retaliate.
Here's a roundup of the latest developments: Syria The four-day ceasefire started at dawn on Friday, but the army warned it would retaliate against rebel attacks, the BBC reports.
Dr Sigman may well be right but rather intriguingly Völler proved the exception to the rule by refusing to retaliate in any way, aggressively or otherwise, bearing his multiple punishments and degradations at the hands of both referee and opponent with a stoicism that bordered on the truly heroic.
Erdos said that data protection can cover "simply privacy intrusion" and that on that basis it might be necessary to consider that notifying sites, which might then retaliate by putting up new content about people, "would cause them unwarranted damage and/or distress".
Netanyahu has refused to rule out further action aimed at preventing advanced or chemical weapons being transferred to Islamic militants, despite the Syrian regime's threats to retaliate on the next occasion.
So to retaliate against two terrorists by lashing out at potentially 1.6 billion people simply doesn't make sense.
Mr Obama has held back from visible trade spats which might spook the market, instead pushing his team to find discreet ways to retaliate against such Chinese bad behaviour as the theft or forced transfer of Western technology, or market-distorting subsidies.
But in the first version of the game he remains ahead if he does not retaliate (50 cents v 30 cents), in the second he comes out equal (50 cents v 50 cents), and in the third he ends up behind (50 cents v 90 cents).The upshot was that in the first two cases about 15% of second players chose to retaliate if they had money taken.
Now the odds of Labour winning, or sharing power with the Lib Dems, have increased.The Tory rebels who voted against Lords reform knew their partners would retaliate.
However, Pakistan would certainly retaliate to open deployment (there was a fuss last year, when some of the missiles were moved, but not supposedly deployed, to a base not far from the border with Pakistan) by deploying the M-11 missiles it has received, but not yet unpacked, from China.
