london spanish government bond stock demand thursday media report say catalonian president carles puigdemont set call snap regional election dec. 20 move could ease tensions madrid barcelona-based la vanguardia say puigdemont take decision bid persuade government prime minister mariano rajoy enforce direct rule region puigdemont make statement 1330 cet 1130 gmt regional government say news positive spain look like puigdemont look ways declare independence say ing strategist martin van vliet sound like call elections madrid invoke article 155 would allow central government suspend wealthy region autonomy spain 10-year government bond yield move inversely price fell basis point 1.58 percent news spain country stock index ibex rise much 1.9 percent four-week high gap spanish german 10-year government bond yield keenly watch measure market sentiment towards spain move tight month spread two widen sharply early month catalonia vote overwhelmingly favor break away spain albeit low turnout oct. referendum declare illegal authorities madrid spanish market rise report possible catalan election