WASHINGTON: Quad countries -- an informal grouping of Australia, Japan, India and the United States -- on Friday condemned North Korea's "destabilising" ballistic missile launches and reaffirmed their commitment to the country's complete denuclearisation.

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In a statement, the four countries also said they reaffirmed their commitment to upholding and strengthening the "rules-based" multilateral trading system and to opposing "coercive economic policies" that run counter to this.