European officials are examining whether the Paks project meets EU rules on state aid and the supply of nuclear material from Russia. The EU sets limits on state subsidies, and has rules designed to prevent EU countries becoming over-dependent on Russia for nuclear fuel.
Russia is supplying weapons to Damascus under contracts completed since the conflict in Syria began in 2011, as well as under earlier deals, President Bashar al-Assad said.
Saudi Arabia accused Russian President Vladimir Putin of hypocrisy on Sunday, telling an Arab summit that he should not express support for the Middle East while fuelling instability by supporting Syrian leader Bashar al-Assad.