Fernandez tested positive for COVID-19 on Saturday. On the same day, doctors assessed the president's health as stable.
"Vladimir Putin congratulated Alberto Fernandez on his past birthday and wished him a speedy and full recovery," the Kremlin said.
In turn, Fernandez said that he highly appreciates Russia's assistance to Argentina in the fight against COVID-19.
"The President of Argentina thanked for the words of support and noted the trust with which he relates to the Russian Sputnik V vaccine, thanks to which he experiences a mild form of the disease. Russia’s assistance in combating the spread of coronavirus was highly appreciated and interest in further close cooperation, including the continuation of the supply of Sputnik V to Argentina, was expressed," the Kremlin added.
Argentina started vaccinating its population using Sputnik V shots in December.