"Such an army would help us to build a common foreign and security policy, as well as jointly assume the responsibilities of Europe in the world," Juncker said in an interview.
A European army, according to the EC president, could "react credibly" to dangers facing the 28-member bloc or its neighbors.
Welt am Sonntag reports the EC head's proposal has found support in the German legislature, with chairman of its foreign affairs committee noting that time has come for the vision to materialize.
"The Europeans spend enormous sums of money for the military combined, much more than Russia. But our military capabilities remain an insufficient security policy as long as we maintain small national armies, which make and buy many parts of the same thing on a smaller scale," Norbert Rottgen was quoted as saying.
Moscow, for its part, has on numerous occasions pointed to an unprecedented expansion of the North Atlantic Treaty Organization toward Russia's western border.