Consider consulting the following US government sites for summaries of different countries’ foreign policies (but note that not all UN member countries are included, some are dated):
Country Studies (from the Library of Congress): http://countrystudies.us
US bilateral relations with various countries can be found at:
US State Department http://www.state.gov
(click on “countries and regions” tab; “A-Z list of countries” plus “State Dept. Country Background Notes”)
US foreign policy issues (which may contain some bilateral information):
White House foreign policy (issues page and blogs/twitter accounts):