Topical hints in our sources: "When the Russians occupy Turkey the mashiach comes," it is quoted in a number of early sources.
The conflict between Turkey and the Russian power increased recently made headlines and caused enthusiasm among those knowledgeable of sources, who see the confrontation as the approaching o the time of mashiach.
In the book 'Orchos Rabeinu' by Hagaon R' Avraham Horowitz zt"l - a student of the Kehillos Yaakov, the Steipler zt "l, it is quoted in his name: "See that it was published that the Vilna Gaon z"l said when Russians occupy Constantinople (Istanbul) the Mashiach will come, and not as I said when the Russians cross the Dardanelles, since they pass the Dardanelles every day."
Furthermore, the Rebbe the Shefa Chaim of Tzanz is quoted on behalf of the Baal Shem Tov who said: "If the Russians will cross the Dardanelles to fight with Turkey, you can wear Shabbos clothes honor of the coming of the mashiach."
Hagaon Rabbi Yechiel Michel Feinstein, son-in-law of the Brisker Rav zt"l, also told of a kabala (tradition) from R' Chaim of Volozin, "when the first Russian soldier lands on Constantinople, the mashiach would come - because Gog and Magog will be between Russia and this country, which in its source is Malchus Edom".
As mentioned previously in Behadrey Haredim, the Av Beis Din of the Eida Hareidis Hagaon R' Moshe Sternbuch also mentioned this tradition in a talk he gave two years ago and said: "I must divulge one secret because it has been revealed by Rabbi Yitzhak Chaver zt"l, a disciple of Rabbi Chaim Voloziner zt"l who heard from word to mouth until the Vilna Gaon zt"l, who revealed this secret close to his passing - and so he said: "When you hear the Russians conquered the city of Krim, you should know the time of redemption begins already, and when you hear the Russians reached the city of Constantinople by then you should wear Shabbos clothes and do not take them off because at any moment the mashiach is coming. "
However Hagaon R' Shmuel Vosner zt"l expressed himself several times that, "we have no dealings with the hidden and the entire issue of the coming of mashiach is unknown and covered and cannot be spoken of in public."