US strike on Mexico by December 31 reflects trader consensus on limited near-term escalation in counter-cartel efforts. Mexican President Claudia Sheinbaum has repeatedly rejected unilateral US military action on sovereign territory, prioritizing bilateral security cooperation, financial sanctions, and domestic operations instead. Recent Trump administration statements emphasize terrorist designations for cartels and potential tariffs over direct strikes, while US officials have clarified that such labels enable tracking and sanctions rather than bombings. Border incidents, including migrant caravans and prior maritime interdictions in international waters, have prompted troop movements to Texas but no confirmed cross-border aerial or missile operations. Diplomatic channels, including upcoming summits, and Mexico’s firm sovereignty stance continue to constrain probabilities, with resolution hinging on verified strikes announced or reported by year-end.