Syrian troops enter Yemen by...?

This market will resolve to "Yes" if Syrian troops enter any part of Yemen by the specified date, 11:59 PM ET. Otherwise, this market will resolve to "No". "Syrian troops" refers to active military personnel officially affiliated with Syria. Only members of the regular armed forces of Syria will qualify. Foreign fighters, private military contractors, mercenaries, or any other personnel recruited, paid, trained, equipped or directed by Syria who are not members of the Syrian armed forces will not qualify, regardless of whether they operate under Syrian command or on Syria’s behalf. Members of the armed forces of any other state, including those operating as part of a Syrian-led coalition, will not qualify. "Enter" means that the Syrian troops, even temporarily, deliberately operate within any part of Yemen, other than as prisoners of war or as emissaries as described below. Bombardment, sabotage, naval presence offshore, or temporary disruption of activity will not qualify on their own. An announcement, threat, or claim of Syrian troop entry will not qualify without actual entry being established. The entrance of Syrian emissaries for the purpose of negotiating an agreement or other diplomatic or commercial endeavors will not alone qualify. … (condensed)