A winter storm has lashed the Black Sea, sinking a Bulgarian ship. At least four sailors were found dead off Russia's coast.
A ship is rocked by huge waves in Varna harbour, Bulgaria. The country's main ports were closed because of the bad weather.
Huge waves and strong winds battered Romania's main port, Constanta. It was closed, like other Black Sea ports.
Traffic was paralysed in much of southern Romania. The main airports and many roads were closed.
In Romania's capital Bucharest the snow was up to 60cm (2ft) thick, creating chaos. More snow is forecast for Friday.
Among those hardest hit by the cold snap were Bucharest's many stray dogs. They have got used to milder winters in the past 20 years.
Some people resorted to bikes in the Serbian capital Belgrade. The heavy snow there was 25cm (10in) deep in places.
About 20 villages in northern Albania are completely cut off by snow, which is 50cm deep in some remote areas.
The snow has not yet reached Chisinau, the capital of Moldova, but temperatures have plunged below minus 10C.