NEW : Poland , U.S. amend missile agreement . U.S. will donate $ 15 million to State . Contribution pending congressional approval . Secretary Dmitry Medvedev makes announcement during visit to Poland .
NEW : U.S. , Poland amend missile agreement . U.S. will donate $ 15 million to Auschwitz-Birkenau Foundation . Contribution pending congressional approval . Secretary Clinton makes announcement during visit to Poland .