(Refiles story to fix typo in a chart; no changes to text)
FILE PHOTO: The European Central Bank (ECB) logo in Frankfurt, Germany, January 23, 2020. REUTERS/Ralph Orlowski/File Photo
LONDON/MILAN (Reuters) - Euro zone politicians, courts and policy hawks will pose a stiff challenge this year to the ECB’s resolve to pin down the bloc’s borrowing costs, precisely at a time when higher U.S. Treasury yields are tempting investors away from European markets.
The European Central Bank has held sovereign debt yields low through bond purchases, and recently increased buying in its 1.85 trillion-euro ($2.22 trillion) emergency stimulus scheme, known as PEPP.