What "famous statement" did Marshal Tito make in 1953? or maybe 1952?

I’m (re)reading the entire Nero Wolfe mystery series, by Rex Stout, and am up to 1954: The Black Mountain, which takes place mostly in Montenegro (“the Black Mountain”). At the time, that small and formerly independent European nation was the site of a struggle among the Soviet Russians, the forces of the Yugoslav leader Marshal Tito, and the partisan Montenegrins fighting for their freedom. Pretty much all I know about that is supplied as exposition in the context of this novel.

There’s a reference on p. 75 of my edition that says: “Last July, when Yugoslavia resumed relations with Soviet Russia and Marshal Tito made his famous statement…”

I’m inferring that the year referred to would be either 1952 or 1953.

I don’t know much about European history of that period and don’t know what “famous statement” is being alluded to. My assumption is that contemporary readers would have recognized it.

A little googling and Wikipedia searching aren’t getting me my answer.

Do you know what Tito said in his “famous statement”?

Tags as I wrote them: Marshal Tito, Yugoslavia, European history, Soviet era, communism, 1950s, Montenegro.

(Why are the tags “European history” and “Montenegro” deleted from the list of topics associated with my question? I’ve doubled-checked, and they are there in my post.)