[n = 6]
| Year / Period | From | To | Established | Ecol. effects |
|---|---|---|---|---|
| unknown | Unknown | Russia | probably not established | |
| unknown | Unknown | Uzbekistan | established | |
| 1971 | USA | USSR | not established | |
| 1977 | Unknown | Bulgaria | established | |
| 1978 | Former USSR | Romania | probably established | probably none |
| 1984 | North America | Hungary | established | probably none |