Scotland, Ireland and Wales face the prospect of playing no further international rugby in 2020 after World Rugby confirmed the remaining fixtures in this year's Six Nations have been cancelled.
Meanwhile, the European qualifying tournament for the 2021 Rugby World Cup - which the Scots and Irish were due to play in - has also been postponed.
Although England have already completed their set of Six Nations fixtures, winning the Grand Slam, there were three matches still to be played - Scotland's trips to Italy and Wales as well as France against Ireland.
Six Nations Rugby chief executive Ben Morel said: "This was an extremely tough decision that was only taken after we had explored every possible option to get these matches played.
"It is especially disappointing that these cancellations come at a time when there is such positive momentum around the women's game and for the Women's Six Nations in particular."
Scotland and Harlequins star Jade Konkel said on Twitter: "[It's] another speed bump along the way but just another thing we will come back stronger from."