The rare move by Sen. James Risch comes as relations between the U.S. and Hungary have become increasingly combative amid Russia’s war in Ukraine.

Sen. James E. Risch, the top Republican on the Foreign Relations Committee, is halting a $735 million U.S. arms sale to Hungary as punishment for the country’s refusal to approve NATO membership for Sweden, a rare move aimed at pressuring Budapest into greenlighting the military alliance’s expansion ahead of a major summit next month.