THE TIGHTENING NOOSE:

U.S. prosecutors say they have a witness who will directly implicate a Russian businessman known as "Putin's chef" in schemes to carry out election interference overseas.

The mystery witness is prepared to testify at a criminal trial set to open in Washington next month in a case special counsel Robert Mueller brought accusing three Russian companies and 13 Russian individuals of meddling in the 2016 U.S. presidential election, a prosecutor declared at a recent court hearing.

The anticipated testimony will focus on the most prominent Russian national charged in the indictment, Yevgeny Prigozhin, a St. Petersburg restaurateur who enjoys close ties to Russian President Vladimir Putin and who has expanded his business empire to become a key contractor for the Russian military.

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