De or het non-interventiebeginsel?

The correct Dutch article is:

het non-interventiebeginsel

Rule Words ending in -sel: usually het. See the rule

How to use non-interventiebeginsel

the non-interventiebeginselhet non-interventiebeginsel
this non-interventiebeginseldit non-interventiebeginsel
that non-interventiebeginseldat non-interventiebeginsel
our non-interventiebeginselons non-interventiebeginsel
your non-interventiebeginseljouw non-interventiebeginsel
every non-interventiebeginselelk non-interventiebeginsel
which non-interventiebeginsel?welk non-interventiebeginsel?
a big non-interventiebeginsel / the big non-interventiebeginseleen groot non-interventiebeginsel, het grote non-interventiebeginsel