The Venezuelan leader is already dismissing critics' concerns over his nuclear ambitions, offering assurances his aims are peaceful and that Venezuela will simply be following in the footsteps of other South American nations using nuclear energy.
Yet his project remains in its planning stages and still faces a host of practical hurdles, likely requiring billions of dollars, as well as technology and expertise that Venezuela lacks.
Russia has offered to help bridge that gap, and Chavez has announced that the two countries have created an atomic energy commission.
"I say it before the world: Venezuela is going to start the process of developing nuclear energy, but we're not going to make an atomic bomb, so don't be bothering us afterward ... (with) something like what they have against Iran," Chavez said Sunday.
The socialist president is closely allied with Iran and defends its nuclear program while the U.S. and other countries accuse Tehran of having a secret nuclear weapons program.
U.S. State Department spokesman Ian Kelly on Monday expressed misgivings about Venezuela's nuclear ambitions. Responding to a reporter's question about whether the United States would be worried about nuclear transfers between Iran and Venezuela, Kelly said: "The short answer is, to that, yes, we do have concerns."
Kelly noted that Venezuela is a signatory of the Nuclear Nonproliferation Treaty, which would restrict any nuclear program to nonmilitary purposes.
Some of Chavez's critics among American lawmakers are alarmed. U.S. Rep. Connie Mack urged the U.S. and its allies to "unite to prevent Chavez from gaining access to new nuclear technology." Rep. Ileana Ros-Lehtinen, a fellow Florida Republican, said Russia's plans to sell Venezuela more arms, along with plans for nuclear cooperation, "create an eerie sense that the history of Iran's Russia-backed military and nuclear buildup is repeating itself almost identically in Venezuela."
"Russia is going to help us right down the middle of the road," Chavez said, using an expression that means openly and with nothing to hide. "Putin himself has said it: 'We're going to support Venezuela so that it has nuclear energy."'
Russia already signed a framework agreement last year pledging cooperation. That agreement is "all there is for the moment," said Sergei Novikov, a spokesman for Russian state nuclear agency Rosatom.
"There are no concrete projects that have been worked out and agreed upon," Novikov told The Associated Press in Russia on Tuesday.
Any joint work on mining uranium or the radioactive metal thorium is likely "a long way" off at this point, Novikov said. He noted that Venezuela says it has deposits but needs to decide whether it wants Russian help exploring them and, if so, create a joint venture for the purpose.
If an agreement is reached for Russia to help Venezuela create a nuclear research center, Russian specialists would likely participate closely to ensure nuclear safety and security, he said.
A Venezuelan delegation visited Moscow last month, and discussed creating programs for training Venezuelan specialists in nuclear safety and in the use of reactors, the Russian nuclear agency said in a statement. It said they also discussed training Venezuelans on designing and building "a cyclotron or research reactor with the aim of producing radioisotopes for medical purposes."
It wouldn't be the first time for Venezuela to build a nuclear reactor. A small, experimental reactor was completed in 1960 at the Venezuelan Institute for Scientific Studies near Caracas. In the past decade, it has been used as a sterilization plant that treats pharmaceuticals, surgical supplies and other products using cobalt-60 radiation.
"Its objective was lost due to technological obsolescence, but we're going to start, and we're working on that with Russia," Chavez said.
It remains unclear what sort of nuclear technology, if any, Venezuela could seek from Iran. Chavez as early as 2005 expressed interest in developing nuclear energy and mentioned Venezuela could discuss it with Iran.
He said while visiting Iran on Sept. 4 that "we're carrying out the visualization of the nuclear energy project, so that the Venezuelan people can also count on that marvelous resource for peaceful uses in the future."
He said Venezuela and Iran agreed to work together on geological studies in the Venezuelan Andes and the foothills in his home state of Barinas, because "we already have satellite information that indicates there are good mineral resources, different minerals that are very important for the country's development." He didn't elaborate, and didn't mention uranium.
It also remains unclear how much Chavez intends to spend on the nuclear project. His government has been coping with a sharp decline in revenue in the past year due to lower prices for Venezuelan oil, which funds nearly half the national budget.
Two other South American nations already use nuclear energy. Argentina has two operating nuclear plants, as does Brazil.
Brazil is also planning to invest $3.7 billion to build a third nuclear plant after receiving environmental approval earlier this year.