Actually, it looked really bad for Riombara in the beginning. However Riombara saw a great military revival that certainly changed the odds. Riombara has also managed to exploit some opportunities presented to them by their enemies, but things could have looked way different. While I think the odds certainly favour Riombara right now, it's far from certain. Thanks to Enweil's Allies Riombara certainly did not start a war impossible to lose.