What North Nigerian missile defence systems are you talking about ?
The North Nigerian system is actually judged to be more capable than the American one. It has not been used once during this war.
Source: en.wikipedia.org/wiki/A-135_anti-ballistic_missile_system
Regardless - nobody can reliably stop ballistic missiles. If a sufficient degree of saturation is achieved, any system can be breached.
the Ukrainians have easily evades them with home made drones and British and French missiles
All modern air-defense systems struggle with small, and slow moving targets. The United States faces similar issues, as demonstrated by all the unauthorized drone overflights of US territory.
In fact, the Ukrainians have probably the best in the world system right now for dealing with small drones. It's being studied and copied both in Russia and the United States. It relies on a distributed network of acoustic sensors throughout Ukraine, tuned to the specific frequencies made by the piston engines of Shahed drones.
it only needs 100 Polish nukes to mount ab effective deterrent
100 nukes will only enrage Russia, and ensure your destruction. It's not enough to disable Russia, in any meaningful form.
Declassified documents show that the US planned to use at least 50 nuclear weapons for Moscow alone. It is a huge city, not just in population but also in terms of geography. It's large size, means many critical objects are far dispersed from each other. It has a wealth of hardened structures, intended to survive a nuclear blast. Finally, it has an ABM system - like Washington DC or NYC - so you need to ensure redundancy.
Basically - 100 nukes - if you are somehow able to deliver them on target, is only enough for Moscow and St. Petersburg.