News from the strong interaction program of NA61/SHINE

The NA61/SHINE experiment at the CERN SPS is a multipurpose fixed-target spectrometer for charged and neutral hadron measurements. Its research program includes studies of strong interactions as well as reference measurements for neutrino and cosmic-ray physics. This contribution summarizes a selected set of new results from our strong interaction program, including system-size and energy dependence of charged kaon to pion production, $\phi$(1020) spectra in Ar+Sc collisions and enhancement over p+p reactions, femtoscopy of like-sign pions 0 in Ar+Sc and Be+Be collisions, $D^0+{\bar{D}}^0$ (open charm) yield in Xe+La interactions, and finally an unexpected excess of charged over neutral kaon production indicating a strong violation of isospin symmetry in Ar+Sc collisions.