U.S. Defense Secretary Lloyd Austin voiced fresh concern on Friday over escalation between Israel and Lebanon’s Hezbollah during his sixth call with his Israeli counterpart in less than a week, and urged a diplomatic resolution to the crisis. Austin’s focus on diplomacy in his statement came after Israeli Defense Minister Yoav Gallant spoke of a new phase of war. Israel announced on Friday it killed a top Hezbollah commander and other senior figures in the Lebanese movement in an airstrike on Beirut. The strike followed two days of attacks on the group in which its members’ pagers and walkie-t…