SummaryPutin wants written pledge to halt NATO expansion eastwards, sources say Russia also seeks lifting of sanctions and protection for Russian speakers in Ukraine Ukraine has insisted on NATO membership aspirations despite Russian demands MOSCOW, May 28 (Reuters) - President Vladimir Putin's conditions for ending the war in Ukraine include a demand that Western leaders pledge in writing to stop enlarging NATO eastwards and lift a chunk of sanctions on Russia, according to three Russian sources with knowledge of the negotiations. U.S. President Donald Trump has repeatedly said he wants to end the deadliest European conflict since World War Two...