| Clue | Source | Date |
|---|---|---|
| First spacewalker Leonov | ||
| Soviet premier Kosygin | The Chronicle of Higher Education | 10 Jun 2016 |
| Soviet premier Kosygin | ||
| Leonov who was the first man to walk in space | ||
| Soviet premier Kosygin | ||
| Kosygin of the Soviet Union | ||
| Comrade Kosygin | ||
| Czar Nicholas II's heir |