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The German press agency DPA reported that these were largely a formality.

Red carnations were laid below pictures of fallen fighters at a memorial on Sunday, press agency Reuters reported, while some attendees lit candles.

The first show will take place on 2 August but the residency is yet to sell out, with 5% of tickets still available, according to German press agency DPA.

"The Associated Press is very concerned by the detention of Russian video journalist Sergey Karelin," the US press agency said in a statement.

More than $10 billion in deals were done there, according to Saudi Arabia’s state press agency.