Without the Triple Entente, war still points toward Russia and France

Who might be on the opposing side in a First World War if the Triple Entente had never formed?

Probably Russia, with Russia and France together also possible.

The counterfactual answer points first to Russia and then allows for Russia and France together. It does not develop an alternative alliance path or diplomatic chronology. This is a tentative alignment rather than a claim that war was inevitable. The exchange treats the historical blocs as contingent political arrangements rather than fixed sides.