gugja'a lujvo

j1 is the president of people g2 in country g3.

Cf. gugde, jatna, balnoltru, vliraitru, viptru, truralju, trupauja'a, vajraifla.

In notes:

balnoltru
t1=n1=b1 is the emperor/empress/kaiser/tsar of peoples/territories t2.
cratse
x1 is a president; x1 is president of x2
nolraitru
t1=n1 is a regent/monarch of t2 by standard n2.
truralju
r1 is the head-of-government of polity t2.
vipnoltru
v1=t1 is the appointed governor/governor-general/lieutenant-governor over territory t2 representing principal v3
presidente
x1 is the head of x2 (state of a republic, a representative democracy or, more seldom, a dictatorship); x1 is a president of x2 (state/organisation etc.)