President Volodymyr Zelensky said on Tuesday Ukraine had no option but to negotiate with Russia to end fighting but that he and Russian President Vladimir Putin might not personally hold talks. Zelensky was speaking after accusing Russian troops of carrying out extra-judicial killings in the town of Bucha west of the Ukrainian capital, Kyiv. Former Russian President Dmitry Medvedev said the reports of civilian killings in Bucha were “fakes” aimed at discrediting Russia. Moscow said it would present “empirical evidence” to a meeting of the United Nations Security Council on Tuesday proving its …