As for the "laser" you were talking about, that is a weapon mounted on the nose of a 747... It takes out IBM's... There are also other options... The first line of defense is the Star Wars Program and its affiliates. Though not complete, this will ultimately use orbital weapons to shoot nukes down before they even leave their country's airspace. The next would be Interceptor Missiles. They are launched from ships and fly at hypersonic speeds to knock nukes out in their launch phase. Once in their main phase, you get the 747 with the laser. Last, you have the Patriot Missile and the like. These are the last line of defense as they are highly advanced missiles that look for trace amounts of radiation, recognize that as the warhead and then strike just below that so as not to set them off... instead of a mushroom cloud, you get a few square miles that need to be quarantined for a couple months...
Yes, they are psychological weapons. The concept of leveling a city in one blast is definitely a threat, but yeah...
I don't consider the Chinese to be allies, but I don't think we'll go to war... The reason is that without us, China has almost no exports and is dead economically. Sure we aren't doing to well, but we aren't the only country this is affecting. It may be hitting us hardest, but we aren't the only ones...
Personally, I believe that this is pretty much the only way WWIII could be started...
NK and Iran become close allies and begin trading information. Both want to conquer the world, but figure they can always conquer the other later... They set up a black market for nuke parts that the two countries use to mass produce them. Soon, Pakistan is caught up in it. Though disapproving of its baby's desire to make nukes and rule the world, (of which it is a part), China does nothing. Eventually, The two have nuclear arsenals that could be used against entire countries, not just a handful of cities... Israel becomes furious and threatens force if they are not dismantled. Iran becomes agitated and fires a salvo at Israel being sure to not hit Jerusalem because doing so would turn the entire world on you. American Anti-IBM thwarts the attack and Israel counterattacks. The small country uses its big brother's (America's) nukes in retaliation.
Without proper defense, Tehran is leveled in minutes. Having expected this, Iran has already hidden all of its government members and then calls on NK, Jordan, Lebanon, etc for help. The Million Man Army of NK then is transported to one of Israel's borders to begin a battle. Israel has far superior technology and is the only country with good weapons, but even good weapons can't stop and endless wall of men with AK-47's...
NK then invades SK and wins quickly due to its excessive use of nukes...
For the first few days, the Israeli air force holds its many enemies at bay, and it appears to be another Seven Days War. That is of course until NK fires a few dozen IBM's toward Israel. Unable to keep all the nukes out, the defense systems let some through. Those hit home in major cities. Without a good chunk of its population, Israel will lose. So, it calls on us. Though hesitant about a true war in the Middle-East, we don't have a choice. We join the side of Israel and begin fighting back.
Not willing to be surrounded or betrayed by its sole reason for existence, Iraq declares neutrality.
Now that we are in true war and are against countries (not individuals) the US can finally show its true military might. Using Nighthawks and B-2's, we quickly demolish everything in sight. Of course, nothing good lasts. Russia enters on the side of NK and of course, has nukes. Preferring not to waste them, it doesn't fire its nukes at us, but rather at the less defended, and more exposed army. Enter the Russian Army...
Though the motherland is in war, the dozen-minicountries spawned by the fall of the USSR declare neutrality. They do allow Russia to move troops through their land with the promise of not being invaded themselves. Russia then moves its troops down through Iran and into the primary front around Israel. extremely outnumbered and now facing an actual military with up-to-date weapons, America calls for aid from NATO. The first to respond is of course, the UK. Then Canada and a few other members of NATO join America. Following them, other countries of the Commonwealth such as Australia, New Zealand, India, and South Africa join Britain, America, and Israel.
With the number of soldiers becoming more balanced again, NK decides it need more troops. Its solution is to threaten China. Using nukes as its trump card, it convinces China to join it against us. Of course, that just raised the stakes by another few million or so...
Realizing it will be invaded sooner or later, Japan joins America in what has become East and West. Having built up its own navy to the point where it once was, it begins to blockade the Eastern coast of Asia and Vietnam which entered on the side of NK. Slowly, this starts to weaken NK as its waters slowly shrink in around it.
The war drags on for years at a stalemate until there is an election in the US. The new president decides it is his duty to end the war and thus presses, "The Big Red Button." more than half of America's nuclear arsenal is launched into the air and without proper defense against it, her enemies are not what one could call lucky... UK follows the US in another barrage as does Israel until hundreds of H-Bombs are in the air. Within minutes, the missiles hit their marks. Every major city in Asia aside from Hong Kong is turned into radioactive glass.
Seeing no point in continuing on the losing side, China switches sides and begins the attack against NK. Furious, Iran launches more nukes at China who is at this point too weakened to do much of anything. Though little was accomplished, one major ally of the East was eliminated. Without China in its way, India quickly pushes through from the south and into Pakistan and then into Iran. With extreme pressure on both sides, Iran begins to shrink up towards Russia.
Unfortunately for them, after America's nuclear strike, Moscow, Stalingrad, and Leningrad no longer exist. Without proper organization, Russia too, begins to shrink as it is pressed from below. Eventually, Japan and Australia win enough naval battles to get to the K peninsula and start fighting on land.
Finally running out of nukes, NK is forced to fall back to its original size. The American Navy uses its carriers to smash the country further into submission with air raids.
(You can guess the rest...)
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Eventually its over, fifty cities are glass, and a few million people are dead. Nothing was gained, but NK, Russia, and Iran are shrunken severely if not dissolved altogether.
In other words, a waste of life...