This text is taken from book...(название учебника)
It is not headlined
The author is...(автор учебника)
The author starts telling us that it is necessary for the jurists to differentiate between international law and national law.
The main idea of the text is to explain the difference between international law and domestic law.
In conclusion the author informs us about the Constitution of The Russian Federation.
I found the text interesting , important and not too hard to understand.