russian military units are returning to their home bases. indeed, our analysts indicate that they remain very much in a threatening position, and the fact remains, right now, russia has more than 150,000 troops circling ukraine and belarus and ukraine's border. and invasion remains distinctly possible. our correspondent caroline davies is in moscow. can you explain a little bit more about this development in crimea? over the course of the last few days we have heard from pressure talking about the fact that once these military drills were over that they were planning to send their troops back to their places. in fact, the kremlin spokesperson had said last week that this would be what would happen but we have already had some level of scepticism about it from the british prime minister, boris johnson, from the american president joe biden, and from nato, so plenty of signs from the west that basically they would believe it when they saw it. so at this stage, more