Russia's long exile from world sports events is about to end. In a watershed moment, the Winter Paralympics will feature the country's athletes competing under their national flag at the event for the first time since 2014, despite its ongoing war with Ukraine. So more than four years since Russia's full-scale invasion of its neighbour, what lies behind the move? Just how controversial is it? And could this lead to other attempts by sports bodies to reintegrate Russia? BBC Sport takes a closer look. What happens when at the Winter Paralympics? With the build-up to the Games already impacted by concerns over travel disruption because of the US-Israel war with Iran, tensions caused by another conflict also threaten to overshadow the event. In protest at the participation of a small number of athletes from Russia and its close ally Belarus, Ukrainian athletes are boycotting Friday's opening ceremony in Verona, along with a host of other nations.…