Free trade—if it results in greater reliance on foreign suppliers, which it pretty much always does—comes at some national security risk, since you're depending

Free trade—if it results in greater reliance on foreign suppliers, which it pretty much always does—comes at some national security risk, since you're depending on sources beyond your control for the supply of more goods and resources. To illustrate by extreme example: that your country has realized its greatest Ricardoan(?) comparative advantage potential and has efficiently converted its entire productive capacity to making teacups is not great if there's a global food shortage and you don't produce any food. Shocks to supply and to the economy (so, things like Covid or Russia invading a neighbor) can cause that risk to be realized as harm, or at least cause the risk to be more evident.