Without U.S. leadership, NATO could weaken, leading to divisions among European countries on military priorities and responses to Russian threats.
Increased military spending without centralized control could lead to unilateral defense actions, raising tensions.
Far-right and nationalist groups in Germany, France, Italy, and Hungary could gain influence, potentially destabilizing democracy.
Some European factions might push for closer ties with Russia, undermining unity in opposing aggression.
Economic strains from higher military budgets could fuel unrest, and national interests could clash, risking EU stability.