Russia and Ukraine are set to hold their first direct peace talks in three years, but hopes for a breakthrough remained dim after Russian President Vladimir Putin spurned an offer by Ukrainian President Volodymyr Zelenskyy to meet face-to-face in Turkey.

Rubio, who spoke to reporters in Antalya, said he would travel to Istanbul for meetings on Friday with Turkey's Foreign Minister Hakan Fidan and a Ukrainian delegation, but said he did not have high expectations for the talks.