Frank-Walter Steinmeier said he would tackle the diplomatic fallout from the latest twist in a more than year-long rift with the US over surveillance when he meets US Secretary of State John Kerry for weekend talks on Iran.
Germany's shock move yesterday to kick out the US embassy intelligence chief followed the emergence within days of two alleged US spying cases, re-igniting German fury after last year's NSA scandal.
"The expulsion is seen in the US as a symbolic action by Germany," Hans Kundnani, research director at the European Council on Foreign Relations, told AFP.
"Still, it will affect the German-US relationship because it is a quite dramatic step to publicly ask the CIA station chief to leave."
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German newspapers applauded the expulsion as a long overdue act of protest, with the conservative daily Frankfurter Allgemeine Zeitung saying Chancellor Angela Merkel was not President Barack Obama's "poodle".
But he cautioned that it must be based "not just on trust" but also "on mutual respect".
"We want to revive our partnership and friendship on an honest basis. In any case, we're ready for that," he told reporters.
That would be his message, he said, when he and Kerry attend international talks in Vienna this weekend on Iran's nuclear programme.
Steinmeier made no attempt to play down the expulsion, which he termed "the right decision, a necessary step and an appropriate reaction to the breach of trust".
Washington has refused so far to break its silence on the spat with Europe's biggest economy, which has launched two probes in the last week into suspected US spying.
German police this week searched the Berlin-area home and office of a man who, local media reported, is a German defence ministry employee accused of passing secrets to the United States.