A military strike does not have to hit every single site....just look for the pinch points that if removed....stop the production of any nuclear weapons.
Then, Combine that with strikes that put the Iranian Oil Production facilities into ruin, destroy their offshore facilities that load Tankers, sink every Iranian flagged/owned tanker throughout the world's oceans.
Turn out the lights by hitting every electrical generation and transmission sites....all by air or sea forces....and you bottle up the Genie.
Re-impose all of the sanctions as were in effect that almost saw the Iranian government go bankrupt and impose sufficient new sanctions to achieve that end.
Follow up by a major effort to support unrest amongst the Iranian people and perhaps we shall see the end of the current regime.
Appeasement and calling for cease fires has never worked....the other side has to understand it has lost and must make the best deal possible... but must accept they cannot prevail and must accept the terms being offered.
Negotiation can only succeed if you are in a "winning" position and the opponent knows and accepts that it is not and is in a clear losing situation.
What one experienced negotiator had to say....
The worst thing you can possibly do in a deal is seem desperate to make it. That makes the other guy smell blood, and then you're dead... Leverage is having something the other guy wants. Or better yet, needs. Or best of all, simply can't do without.
Unfortunately, that isn't always the case, which is why leverage often requires imagination, and salesmanship. In other words, you have to convince the other guy it's in his interest to make the deal.
Commonsense tells us that you negotiate from a position of strength....not weakness. (For you Brits....think back to Chamberlin v. Hitler prior to WWII). All Chamberlin obtained was some time to delay what was coming.
Hitler was intent upon War....was way ahead of Great Britain in its preparing for that War and thus felt to be in a superior position and in the end that Agreement was not worth the paper it was written upon.
Does anyone think the Mullahs in control of the Iranian Government are much different than the Germans in that regard beyond using proxies for the majority of their military aims as their record of war making did not turn out all that well back when they took on the Iraqi's under Saddam Hussein.