ZURICH, April 16 (Reuters) - Estimates that Swiss bank UBS will require another $15 billion to $25 billion in capital under government proposals aimed at making the banking sector more robust are broadly right, Swiss Finance Minister Karin Keller-Sutter was quoted as saying on Tuesday.

"That's right, those orders of magnitude are plausible," Keller-Sutter told the Tages-Anzeiger newspaper. (Reporting by Dave Graham; Editing by Jamie Freed)