Austria-Hungary broke off diplomatic relations and mobilized. (BNCI)
Sri Lanka broke off diplomatic relations with Israel on April 20, 1990, announcing that it would restore them when Israel recognised the PLO, withdrew from the occupied territories and agreed to participate in an international peace conference. (BNCI)
Britain broke off diplomatic relations with the Syrians four years ago after allegations that they'd been involved in trying to below up and Israeli airliner. (BNCI)