Tuesday afternoon, Alex van der Zwaan became the first person to receive sentencing in Special Counsel Robert Mueller's probe, receiving 30 days in prison and $20,000 in fines.

Why it matters: There four other subjects who have pleaded guilty and have yet to receive their sentence. Meanwhile, Paul Manafort has stuck with his "not guilty" plea and will go to trial in September.

Michael Flynn

• Charge: Lying to the FBI
• Plea: Guilty
• Potential sentence: 0 to 6 months, sentencing hearing date is expected to be announced on May 1.

Paul Manafort

• Charge: Bank fraud, conspiracy, lying on taxes, money laundering, failing to register as foreign agent.
• Plea: Not guilty
• Potential sentence: TBD, trial begins Sept. 17

Rick Gates

• Charge: Failing to register as foreign agent, bank fraud, conspiracy, lying on taxes, lying to the F.B.I.
• Plea: Guilty to one count of conspiracy and lying to the F.B.I.
• Potential sentence: 57 to 71 months

George Papadopoulos

• Charge: Lying to the FBI
• Plea: Guilty
• Potential sentence: 0-6 months

Richard Pinedo

• Charge: Identity fraud
• Plea: Guilty
• Potential sentence: Up to 15 years

13 Russians, 3 Russian entities

• Charge: Conspiracy, bank fraud, identity theft, meddling in U.S. election
• Plea: TBD
• Potential sentence: Forfeiture, financial charges