The first trial to emerge from special counsel Robert Mueller’s Russia probe is set to start Tuesday when former Trump campaign chairman Paul Manafort appears before a federal judge in Alexandria, Virginia. Mr. Manafort is facing 18 criminal counts, including bank and tax fraud, which could net him 30 years in prison. He has pleaded not guilty to all charges. The charges stem from Mr. Manafort’s lobbying in the Ukraine on behalf of politicians with ties to Russia. Prosecutors have alleged he was paid more than $60 million for his work, which includes support of former Ukrainian President Viktor Yankovich....