This group of medals belonged to Petty Officer (Motorman) 2nd Class Boris Andreevich Ivanov, second mechanic on a torpedo boat of the 9th Torpedo Boat Squadron, Black Sea Fleet. He was born in Leningrad in 1918, and enlisted in the Navy in October 1938, being sent to the opposite of where he grew up- the Crimea! 

His medal "For Valor" was awarded on 8 June 1943.  Next, he was awarded the Ushakov medal, on 13 October 1945, and finally the Order of the Great Patriotic War, First Class on 30 March 1946. 

While we do not know what exactly his Ushakov medal was awarded for, we do know that the "Medal of Ushakov" (as it is properly known) was awarded for courage and bravery displayed while defending the USSR at sea, in war as well as peace.  It was awarded to soldiers and sailors, petty officers, non-commissioned officers, chief petty officers and warrant officers of the Navy and Naval Border Guards. 

The first awards of the Ushakov medal took place on 24 April 1944, and the medal was awarded approximately 15,000 times prior to 1991. (Very few awards were for actions other than during the Patriotic War.  Ushakov medals with serial numbers well into the 13,000 range were still being awarded for WW2 actions late in the 1940's.) 

Petty Officer Ivanov's For Valor medal is also unusual as it still maintains its original small suspension, which, according to regulations, should have been interchanged with the five sided suspension in 1943/44.  However, since he quite possibly never wore his awards until the end of the War (his job as a motorman, especially on a smallcraft like a torpedo boat would have precluded that.)

An interesting point to note is his Order of the Great Patriotic War, First Class.  This order was awarded to him in early 1946. Evidently, there was a considerable backlog of awards in his chain of command, as was very common at the end of the War.  

Finally, an last note is regarding both his Odessa and Sebastopol Defense medals.  The addition of the 'Defense of the Caucuses' medal shows that he really got around!  It is unfortunate that groups like these are not more easily researchable, as I am certain that he had a fascinating career through the War.  

Additional photos of Ivanov's Group