By Daren Butler, Ece Toksabay and Umit Ozdal ISTANBUL/ANKARA (Reuters) - Talks aimed at ending a 40-year-old militant conflict have fostered peace hopes in Turkey but the precarious situation of Kurdish forces in Syria and uncertainty about Ankara's intentions have left many Kurds anxious about the path ahead.

Battles between Turkish-backed groups, supported by air strikes, and Kurdish-led forces killed 37 people on Thursday in Syria's northern Manbij region, a war monitor said.The Syrian Observatory for Human Rights war monitor reported "fierce battles in the Manbij

Defense Secretary Lloyd Austin told The Associated Press that the U.S. needs to keep troops deployed in Syria to prevent the Islamic State group from reconstituting as a major threat.

Since the fall of President Bashar Assad regime, tensions across the Middle East have continued to remain high.

U.S forces are still needed in Syria to prevent ISIS from reconstituting as a major threat following Assad's ouster, Defense Secretary Lloyd Austin said.