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"It's clear for me that the ban has to come," she said, according to German press agency dpa.

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.