New Delhi, July 10 -- US Secretary of State Marco Rubio voiced disappointment over the lack of progress in negotiations to end the war in Ukraine after a meeting with Russian Foreign Minister Sergey Lavrov on the sidelines of the ASEAN summit in Kuala Lumpur.

Speaking to reporters after the meeting, Rubio said he remained "frustrated" by the absence of movement toward a ceasefire, even as some ideas were exchanged during the discussion.

"There were some ideas that were expressed today, some viewpoints that they expressed to us that I'll take back to the president for his consideration," Rubio said.

"I don't want to overpromise," he added, citing the "acceleration" of Russian attacks on Ukraine.

Rubio emphasised that while diplomacy re...