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> Any country that can launch a satellite has a technology to destroy one

It's easier to put something in orbit than to knock something out of orbit.

You can destroy something without taking it out of orbit. The pieces will happily carry on along their orbital trajectories.

It's easier to put something in orbit than to hit something in orbit.

Well I'll disagree with my own unsubstantiated claim. Consider that its easier to manufacture flak shells than make airplanes. The same applies to space.

Not meaningfully. If you can get into a similar orbit, it's easy in comparison to intercept.

You don't even need much of a missile, if you happen to have an air force; back in 1985 the USAF did a test in which the pilot of an F-15 shot down a satellite, from an altitude of 38,000 feet.

Aren't GPS satellites geostationary?

no, they are not.