Obama's comments came after NATO said Wednesday that Russia had massed some 20,000 troops on Ukraine's border and could use the pretext of a humanitarian mission to invade, Censor.NET reports citing Reuters.
At a news conference at the conclusion of a U.S.-Africa summit in Washington, Obama was asked whether the U.S. would reconsider sending lethal aid to Ukraine.
"Well keep in mind that the Russian army is a lot bigger than the Ukrainian army. So the issue here is not whether the Ukrainian army has some additional weaponry," Obama said, noting that the separatists had not been able to match the Ukrainian army's strength so far despite causing a lot of violence.
"Now if you start seeing an invasion by Russia, that's obviously a different set of questions. We're not there yet," he said.