The entry into operation of the world’s largest superyacht has been put back.

According to reports, Russina owner, Roman Abramovich, will have to wait a few weeks longer while trials are completed and various last-minute problems resolved.

The 168m (550ft) yacht was scheduled for completion late last year.

It is believed that builders Blohm Voss, have outstanding work to do on the navigation systems, helipad, engine vibrations and paint work.