* G20 debt relief requires vigilance: U.S. Treasury Undersecretary McIntosh

* Initiative has helped 46 countries defer over $5 billion in debt service payments: McIntosh

* Need for extra economic aid remains: McIntosh (Adds quotes on extra economic aid)

TOKYO, Dec 8 (Reuters) – Continuing vigilance is needed to check that China and other countries participate transparently in a Group of 20 debt-relief framework, U.S. Treasury Undersecretary for International Affairs Brent McIntosh said on Tuesday.

Leaders of the worlds 20 biggest economies last month endorsed a plan to extend a freeze in debt-service payments by the poorest countries to mid-2021 and agreed to a common approach for dealing with debt problems beyond…

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