What a change in military strategy means to the U.S. and to the enemies of freedom?

“As part of our defense, we must modernize and rebuild our nuclear arsenal, hopefully never having to use it, but making it so strong and powerful that it will deter any acts of aggression. Perhaps someday in the future there will be a magical moment when the countries of the world will get together to eliminate their nuclear weapons. Unfortunately, we are not there yet.” Pres. Trump – 2018 SOTU

Looking at the decision to rebuild the military from the aspect of change of strategy. What will this change in strategy mean to the U.S. and to the enemies of freedom around the world?