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He welcomed comments made by Trump's envoy to Ukraine, retired Gen Keith Kellogg, who described Russian concerns over Nato enlargement as "fair".

Biden had previously been diagnosed with benign enlargement of the prostate.

But the enlargement of life itself is profound.

What America really needs are open markets, fiscal responsibility and stable trade relationships — not a rerun and enlargement of the last trade war.

The diagnosis was made after a separate issue of concern was noted during treatment for benign prostate enlargement, a Palace statement said when his illness was made public last year.