Where do I list monthly pensions distributions from a former, international employer, when the plan is not qualified and the employer does not issue any tax documents?

You need to enter that as a substitute Form 1099-R in TurboTax.

To enter a substitute form 1099-R in Turbo Tax Online follow these instructions:

1. Find the Retirement Plans and Social Security menu option in the Wages and Income section of TurboTax
2. Start or Update IRA, 401(k), Pension Plan Withdrawals (1099-R)
3. Choose Add (Another) 1099-R
4. Choose I'll type it in myself
5. Choose the source of your 1099-R form
6. Enter your pension income into the Form 1099-R entry screens
7. When you come to the screen that says Do any of these situations apply to you? Check the box that says I need to file a substitute 1099-R and follow the instructions