Naboo Crisis (UoS)

The Naboo Crisis was a brief confrontation between the two major powers during the collapse of the Republic -namely, the Sith Empire and the Union of Systems- over the Naboo System and the Chommell sector

The Way to conflict
By 18 BBY, the Republic was a shadow of it's former self, as it's armies were busy keeping order in the core, the Union was left to deal with a resurgent Sith Empire, and it's main ally the Mandalorian Death Watch-led new government, at early 18 BBY, the Union issued Operation SHIELD which gave an advantage to the Union forces, it also allowed them to know that the Sith and Mandalorian fleets were mobilizing, when the information reached Queen Apaliana, she asked for the Union protection

Standstill
By mid year 18 BBY, the Union had a battle group -the 7th fleet- on the Naboo system, the orders to the Sith forces were not to engage, specially after the attempt by the Mandalorians to destroy the fleet, as most of the Mandalorian Fleet was destroyed with almost no loses for the Union, for over six weeks Union and Sith fleets were waiting for the other to make a move

Breaking Point
After six weeks, the Union Congress decided to open negotiations with the Sith in order to end the stalemate in the Chommell Sector, after a series of negotiations in Ryloth the Sith reclutantly agreed to retire their troops from the sector, provided that the Union would not attack the Empire or it's allies

Aftermath
During the Conflict, the supreme chancellor Bail Organa was deposed by a coup, and granted asylum by the Union, the coup, which reorganized the republic in a more authoritarian form, along with the peace treaty between Sith and Union -the Union and the Mandalorians only have a ceasefire- both events can be considered the beggining of the Cold War