The deal is being arranged under the mediation of the NATO Consultation, Command and Control Agency, which on November 10 sent NATO members an invitation to take part in a radar tender.
The winner of the tender will be decided in 2009, while bringing the radars into service and training personnel will continue until late 2015.
The ministry plans to allocate about 34.8 million euros ($43.6 million) to buy the radars. The sum will be paid in installments.
"Perfecting the monitoring of the airspace is a priority task to develop regional defenses," Defense Minister Juozas Olekas said.