MOSCOW/LONDON, May 24 (Reuters) - Russian President Vladimir Putin is ready to halt the war in Ukraine with a negotiated ceasefire that recognises the current battlefield lines, four Russian sources told Reuters, saying he is prepared to fight on if Kyiv and the West do not respond.

Three of the sources, familiar with discussions in Putin's entourage, said the veteran Russian leader had expressed frustration to a small group of advisers about what he views as Western-backed attempts to stymie negotiations and Ukrainian President Volodymyr Zelenskiy's decision to rule out talks.