WASHINGTON (AP) — President Barack Obama said Friday he was reassessing the U.S. relationship with Russia because of a growing number of issues on which the two countries differ, and he lamented what he called his mixed success in trying to persuade Russian leader Vladimir Putin to abandon a Cold War mentality.

Obama’s comments at a White House news conference just two days after cancelling a planned summit with Putin next month came as senior U.S. and Russian officials met at the State Department to look at areas in which cooperation is possible. Those officials put a brave face on the badly strained ties and said the meeting produced some tangible results on the military front and on the push to forge a political solution to the crisis in Syria, among other issues.