2.Another way is Multiple Kill Vehicle (MKV) developed by US
The latest trick the U.S. Missile Defense Agency (MDA) would like to field is the Multiple Kill Vehicle (MKV), an ABM with lots of smaller-sized kill vehicles on board. Lockheed Martin is currently developing the MKV to fit into the same space that Raytheon's hit-to-kill vehicle takes up on the U.S. Ground-Based Interceptor being deployed in Alaska this year. The MKV would work a lot like a MIRV It would have a "bus" that would hold dozens of coffee-can-sized kill vehicles and a long-range infrared sensor to spot an approaching cluster of objects such as a bunch of MIRVs and decoys. The bus would assign each kill vehicle a target and provide in-flight targeting updates. With dozens of smaller vehicles, every probable target in an inbound missile attack could be hit, including warheads, decoys, and junk parts that simply look threatening.
MDA would first use MKVs to complement existing single-shot kill vehicles and ultimately replace them. The MKV design is scalable, so it could be incorporated on smaller systems such THAAD using fewer kill vehicles. Even providing a smaller system such as THAAD or the Navy's Standard Missile with a couple of smaller kill vehicles would be beneficial. Flight tests are expected around 2010. Doug Mohney.
Strategic Nukes: MIRV and Counter-MIRV [Archive] - Military Photos
. But Once Multiple layer of ABM and SAM will be in place, Pakistan corrupt people will start mass production or import of Missiles. 
