US Vice President JD Vance and Armenia's Prime Minister Nikol Pashinyan have agreed to collaborate in the nuclear energy sector.
The two leaders said they completed negotiations on Monday on what is known as a "123 Agreement."
123 Agreements allow the United States to license nuclear technology and equipment to other countries.
The deal relates to small modular reactors, Vance said after meeting Pashinyan in the capital, Yerevan.
The agreement would allow up to $5 billion (€4.2 billion) in initial US exports to Armenia, plus an additional $4 billion in longer-term fuel and maintenance contracts, according to Vance.
Armenia is seeking an alternative to its ageing Russian-built nuclear power plant, Metsamor.
The new US agreement doesn't bind Armenia to purchasing a nuclear reactor from the US.
Rather, it gives Armenia the possibility of selecting the US from a list of options, which also includes Russian, Chinese, French and South Korean companies.
Vance also said the US was ready to export advanced computer chips and surveillance drones to the former Soviet republic.
