Russian President Vladimir Putin (L) congratulates Prime Minister Dmitry Medvedev (R), while visiting the electoral staff of United Russia party in Moscow, Russia, September 18, 2016.

A picture made available 13 September 2016 shows people standing together as the sun sets on the horizon in Hanover, Germany, September 12, 2016.

An image released by Syria`s Arab News Agency (SANA) shows Syrian President Bashar al-Assad (C-R) walking on the streets after Eid al-Adha prayers at Saad Ibn Muaz Mosque in Daraya city in Damascus Countryside, Syria, September 12, 2016.

An Iranian worker weighs a sacrificial sheep for Eid Al-Adha celebrations at a market in Tehran, Iran, September 12, 2016.

A digger works around the area on the 65th kilometer of the railway track Wroclaw-Walbrzych, during the attempt to explore the existence of the so-called `Nazi Gold train`, in Walbrzych, Poland, 16 August 2016.

An exterior view of the `Schloss Babelsberg` castle in Potsdam, Germany, 16 August 2016. Restoration works have been completed on the surrounding terraces and fountains.

Commuters disembark a train at London Bridge station in London, Britain, 16 August 2016. Rail fares are set to increase by 1.9% in January 2017. Labour leader Jeremy Corbyn renewed his pledge to renationalise the railways under a Labour government.