2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/226574Recent lattice studies on (semi-)leptonic kaon decays towards a precise determination of V_us are reviewed. Attention is given to recent unquenched calculations and consistency of their results with chiral perturbation theory.Invited talk at Kaon International Conference (KAON'07), Frascati, Italy, 21-25 May 2007High Energy Physics - Phenomenologytext