BERLIN — U.S. Defense Secretary Lloyd Austin met his newly appointed German counterpart for talks that have taken on a new urgency as Berlin has placed conditions on the delivery of tanks and top Ukrainian officials continue their appeal for them. German Chancellor Olaf Scholz stressed in a call with President Biden that for Germany to unlock a package of Leopard 2 tanks for Ukraine, Washington should send tanks, too, according to a German and a U.S. official, who spoke on the condition of anonymity to discuss the private conversation. Earlier this week, the United Kingdom became Ukraine’s first backer to pledge to send tanks.