Venezuelan President Hugo Chavez is seeking to deepen ties with Iran, with discussions on holding joint military exercises and obtaining uranium, according to Bush administration officials. Hamas also is talking to Caracas about sending representatives to Venezuela to raise money for the militant group's newly elected Palestinian government. But relations with another ally, Russia, have soured over a deal in which Moscow is selling 100,000 AK-47s to Venezuela. The South American country was counting on receiving new rifles, but Russia has shipped a number of refurbished models, prompting Caracas to halt the deal, the U.S. sources said. Mr. Chavez's continuing...