Kerry told the United Nations Security Council that the US would not object to Russians hitting Islamic State or al-Qaida targets but airstrikes just to strengthen the hand of Syrian President Bashar Assad would be worrisome.
"It does appear they were in in areas where there probably were not ISIL forces," Carter said of the Russian airstrikes, using an alternative acronym for Islamic State. He would not go into more detail.
Carter said the strikes highlight a contradiction in Russia's approach. He said the Russians should not be supporting the Assad government, and their military moves are "doomed to fail."
Carter also expressed disappointment that the Russians did not use formal channels to provide the US with advance notice of its airstrikes, but instead sent an official to the US Embassy in Baghdad.
Also Read
"That is not our position. At least some parts of the anti-Assad opposition belong in the political transition going forward. That's why. The Russian approach is doomed to fail."
White House spokesman Josh Earnest said the new action "calls into question their strategy, because when President Putin and President Obama had the opportunity to meet at the UN earlier this week much of their discussion was focused on the need for a political transition inside Syria."
"If Russia's recent actions and those now ongoing reflect a genuine commitment to defeat (the Islamic State) then we are prepared to welcome those efforts and to find a way to de-conflict our operations and thereby multiply military pressure on ISIL and affiliated groups," Kerry said.