US officials have shored up support from more than a dozen countries to confront Islamic State militants in Iraq and Syria. But despite a top-level diplomatic push, Turkey is less likely to play an active role.

Turkey, which borders Iraq and Syria, said late last week that it would not support strikes against Islamic State militants and it would not allow a US-led coalition to launch strikes from its bases, a government official told Agence France-Presse.

The Pentagon is looking for coalition members to conduct intelligence, aerial refueling, airlift and training, a senior US defense official said last week. The US has been conducting airstrikes in Iraq since August and is preparing to expand those strikes to Syria. […]