The rain radar is limited in range because the stations are mostly on the coast. They usually reach Northern France.
If you click "rainfall" you can see the theoretical maximum range of the radar stations.
"Lightening" is captured by widely-spaced radio receivers tightly synchronised so it can triangulate by time of arrival of the signal. Was originally used by electricity transmission and distribution industry because they can match time of strike to lightening damage to lines, and calculate the position of the damage. There is now a European network of these so you can plot the movement of storms from Ireland and Portugal to Poland and sometimes Ukraine. It does not appear to show the Russian republics.