"by proxy of" is a correct phrase and can be used in written English.
It means "through the agency or representation of" someone or something. Example: The company's CEO was unable to attend the conference, but they were represented by proxy of their Vice President.
But for Cuba's leaders, it is much more: a test by proxy of its Communist system of government.
In the war by proxy of the sort that has characterized the history of modern Sudan, Kony has been one of the beneficiaries of Khartoum's airdropped largesse.
"Shall I make you, and you make me complete?" he has asked Christian earlier, when first proposing the courtship by proxy of Roxane.
Those of us raised on dour postwar performances of Bartok's music tend to forget that he was musically the child of Liszt and, by proxy, of Wagner as well.
I certainly wasn't expecting to find out that Gill was a member by proxy of the celebrity aristocracy, having once been splashed over 10 pages of OK magazine in a photo extravaganza celebrating his marriage to Angus Deayton's sister-in-law, nor to discover that he is the godfather of Heavenly Hiraani Tiger, the daughter of the late Paula Yates and Michael Hutchence.
Chávez has, at times, publicly distanced himself from the FARC, most recently last week, but the group's espousal of Bolivarian ideals, and its strategic position, appears to have tempted him into seeing the organization as a means, if only by proxy, of confronting the U.S.; Colombia is one of America's closest allies in the region.
"To me, you've now got in Europe a sort of government-by-proxy of everybody, which has now got carried away.
In October 1600 Rubens accompanied the duke to Florence to attend the marriage-by-proxy of Gonzaga's sister-in-law Marie de Médicis to King Henry IV of France, a scene Rubens was to re-create a quarter-century later for the queen.
Raymond's large block of shares was ripe for acquisition by proxies of the Ring.
That conflict divided the world into two camps, in a titanic struggle of ideas, with countless hot wars fought by proxies of the superpowers.
Saudi Arabia is a predominately Sunni Muslim country and the Saudis are starting to think they're getting encircled by proxies of Iran wherever they look: in Lebanon, Syria, Iraq and now Yemen.
