Chavez, 58, has been undergoing "chemotherapy of strong impact, " Villegas added without providing further details.

NPR: Venezuela: Chavez Hit By New, Severe Infection

The latest plan spells out "procedures for consultation and action" for a combined response, the U.S. forces said, without providing further details.

WSJ: U.S., South Korea Sign Military Contingency Plan

German Foreign Minister Guido Westerwelle wished the 79-year-old Mr Talabani "a quick and full recovery", without providing any further details.

BBC: President Jalal Talabani in 2007