Turkey’s President Recep Tayyip Erdogan headed on Tuesday to Washington to attend NATO’s 75th anniversary summit in the US capital, where he is expected to urge heads of states to stop Israel’s war on Gaza. “During NATO leaders summit, we will raise massacres of the Palestinian people in Gaza, where our shared values are going through sincerity test,” said Erdogan during a press conference ahead of his departure for Washington. “We will emphasize that the international community has failed to stop Israel and that the global conscience will not be able to breathe a sigh of relief until a just a…