Turkish aircraft have attacked Kurdish rebel positions inside Turkey for the first time in two years as relations between the Turkish government and the Kurds deteriorate because of Turkey’s failure to help the Kurdish defenders of Kobani under attack by Isis.

F-16 jets struck at a target they claimed was held by the Kurdistan Workers’ Party (PKK), which has fought for Kurdish self-rule in Turkey since 1984, but has had a ceasefire since 2013. The Turkish military said it was responding “in the strongest possible way” to the shelling of an outpost by PKK forces. The PKK say they were responding to a military strike.

The Turkish government appears to calculate that the imprisoned PKK leader Abdullah Ocalan does not want the faltering peace process to end and that the PKK cannot fight in both Syria and Turkey. Mr Ocalan says, however, that if Kobani falls then it will be the end of the peace process.

Today, US-led forces said they had conducted 21 airstrikes focused on halting Isis advances at Kobani in the last two days. That came as Barack Obama held talks with military leaders from some 20 countries, including Turkey and Saudi Arabia. “It is part of ongoing efforts to build the coalition and integrate the capabilities of each country into the broader strategy,” said a White House spokesman.

Representatives of countries including Australia, Canada, France and Germany were expected to attend.