And ICBMs are harder to hit that is why israel develops it with USA support. What is challenging and harder than ballistic missile defense is having the ability to hit satellites any time, that needs huge technology , you need to have ability to reach any satellite anytime with your system. you may need to go to several altitudes to reach specific satellite anytime. That is the most challenging work in air defense systems.No country may have this capability at the moment.
Dont talk about a subject with out having a clue!! Check what is SM-3 missile , most probably you dont know what it is.
https://en.wikipedia.org/wiki/Operation_Burnt_Frost
Operation Burnt Frost was a military operation to intercept and destroy non-functioning U.S.
National Reconnaissance Office (NRO) satellite
USA-193.
[1] The mission was described by the Missile Defense Agency as a "mission of safeguarding human life against the uncontrolled reentry of a 5,000 pound satellite containing over 1,000 pounds of hazardous hydrazine propellant".
[2] The launch occurred on 20 February 2008 at approximately 10:26 p.m. EST from the
USS Lake Erie, using a heavily modified
Standard Missile-3 (SM-3) to shoot down the satellite. A few minutes after launch, the SM-3 intercepted its target and successfully completed its mission.
[2] The operation has received much scrutiny from other countries, mainly China and Russia.
[3]