"China, Russia are conducting a policy of influence through the vaccine even before vaccinating their own population," France's top diplomat said on Friday.
Hungary became the first EU country to order the Sputnik V COVID-19 vaccine. Now it's published its contract with Russia for the jabs.
It raises a potential problem for Europeans who have had the Russian or Chinese vaccine.
Slovakia became the second European Union member state, after Hungary, to purchase doses of the Sputnik V vaccine following a secret deal orchestrated by Prime Minister Igor Matovic.
Slovakia signed a deal to acquire 2 million doses of Russia's Sputnik V vaccine even though it has not received approval from the EU regulator.
EU leaders have expressed their concerns about the use of the Russian vaccine amid fears Russia will use it to extend its influence in the bloc.
It becomes the first EU country to use the Sputnik V jab after European officials said no application had been received for a rollout across the bloc
BREAKING: Russia's Sputnik V vaccine has an efficacy of 91.6% against COVID-19, according to a study published in The Lancet.
The US movie director told Russian state TV that he had received the first of two jabs of the Sputnik V vaccine.