  Using global wheat trade data and a network model for shock propagation, we
study the impact of the Ukrainian crisis on food security. Depending on the
level of reduction in Ukrainian wheat exports, the number of additional
individuals falling under the minimum dietary energy requirement varies from 1
to 9 millions, and reaches about 4.8 millions for a $50\%$ reduction in
exports. In the most affected countries, supply reductions are mainly related
to indirect trade restrictions.
