Trump has the full picture of what European security costs. The US has at least 1 and often more FBM submarines patrolling near the area of conflict to deter Russian nuclear aggression. That submarine cost between $5-10 billion to build. It costs over $200,000 to run each year, NOT counting parts and maintenance, personnel costs, personnel training or salaries. A periodic refueling and overhaul runs about $1 billion. The US could get by with at least 1 and possibly 2 fewer FBM submarines if we weren't protecting you at this very moment from Putin's nukes. And that is just 1 weapons platform that the US military employs to protect the area of conflict.
Protecting northern Europe and eastern Europe, including Ukraine, against Putin costs the US a hell of a lot more than the $119 billion figure given as direct aid.