De or het diplomademocratie?

The correct Dutch article is:

de diplomademocratie

Rule Words ending in -tie and -sie: almost always de. See the rule

How to use diplomademocratie

the diplomademocratiede diplomademocratie
this diplomademocratiedeze diplomademocratie
that diplomademocratiedie diplomademocratie
our diplomademocratieonze diplomademocratie
your diplomademocratiejouw diplomademocratie
every diplomademocratieelke diplomademocratie
which diplomademocratie?welke diplomademocratie?
a big diplomademocratie / the big diplomademocratieeen grote diplomademocratie, de grote diplomademocratie