On September 18, President Trump signed into law a Russia sanctions bill, formalizing a convergence of executive and congressional will around economic pressure on Moscow. The act transforms what might have been a reversible policy posture into a legislative mandate — one that binds future administrations and signals to allies and adversaries alike that American resolve, at least in this moment, has been codified. The precise shape of the sanctions remains to be revealed, but the signing itself marks a threshold: a line drawn not by decree, but by law.