Soldiers arrested leftist President Manuel Zelaya Sunday as he planned to carry out a controversial referendum to extend presidential term limits, despite a Supreme Court ruling that the vote would be illegal.
Cuba has shown no desire to rejoin. Socialist states like Venezuela and Nicaragua say they want to form an association that excludes the US.
With oil prices down by half since July, the Venezuelan leader's largess may dry up.
Leaders at Wednesday's summit in Nicaragua blamed US trade policies for the region's food crisis.