Yugoslavia consisted of many contemporary countries. Serbia is only one of them.
Would Russia want Yugoslavia back?
to my mind, yes, but it is hardly possible. Some of its former parts switched the religion to islam or catholic.That is main reason of cultural difference.
Talking about putting countries back on the map with cultural changes, I wonder what Russians would think about putting Austria-Hungary back on the map. After all, Russia and Austria-Hungary were allies before world war 1 made them enemies. I speculate that a restored Austria-Hungary would be a useful Russian ally today, against the newly constructed Franco-German expansion to the east. What would Russians think about replacing the Central European countries with Austria-Hungary, as a restoration?
I do protest. Austro-Hungarian monarchy was just a moment in history (1867-1918), but it was a huge failure.
" Between 1820 and 1920 over 3,700,000 people emigrated from the Austrian-Hungarian Empire to the United States. Only Germany (5,500,000), Ireland (4,400,000) and Italy (4,190,000) had higher figures.
An investigation carried out in 1978 revealled that since 1820 over 4,315,000 people emigrated to the United States from Austria-Hungary. This amounted to 8.9 per cent of the total foreign immigration."
Source:
Austrian-Hungarian Immigrants
But Austria-Hungary was the only solution that didn't force country border walls across people's villages. Currently, languages are weaponized in all of the successor countries of Austria-Hungary, that the communist put on the map. Austria-Hungary didn't weaponized languages, it had only two, German and Hungarian, but mostly German only everywhere. When you bring all government and business administration under one single language like this,that is when borders fall. You can't pretend that some European Union opens borders, when administrative languages are kept border specific. So, for all countries in Central Europe, if they are interested in globalization, as opposed to small fascistic isolation, the correct way to proceed is to reunite under the traditions of Austria-Hungary, at least in the linguistic and financial sense, using only one single administrative language in all offices in all those countries. If they hate German, English would do too, but needs to be compulsory, like it is in India, that follows this model. In the case of Central Europe,a new war may still be needed though to reestablish such a true unification. But hell, even old Ghandi too had to threaten a few of the 19 states of India with war, to establish that country.
The Hungarian language a retired language, but we do not kill it because elderly.

It is possible that the Hungarian language is not weaponize, but fact it older than the English language. Hungarian written regulations also existed before the birth of the English language.
GĆ”rdonyi GĆ©za, Hungarian writer and journalist (1863-1922) : āThe most treasured possession of a people is its language. No matter what they lose, they can regain but if they lose their language, not even God can give it back.ā
Only a few reviews about the Hungarian language:
Jakob Grimm; Fairytale writer and the first German grammar scientist (XIX century):
" ...the Hungarian language is logical, has a perfect structure and surpasses every other language. ".
1480
MARCIO GALOTTI, a humanist in the court of King MĆ”tyĆ”s Corvinus stated with amazement: āThe Hungarians may be aristocrats or peasants but they all use the same language.ā
1790
JOHANN GOTTFRIED HERDER acknowledged that the Hungarian language is a great treasure: āIs there anything more dear to the people than their own language? Their whole way of thinking lies in their language, their past and their history, their beliefs, and the basis of their whole life, their whole heart and soul.ā
1830
SIR JOHN BOWRING, English traveler and writer, visited Hungary and published an anthology in English of the work of Hungarian writers and poets. āThe Hungarian language goes far back. It developed in a very peculiar manner and its structure reaches back to times when most of the now spoken European languages did not even exist. It is a language which developed steadily and firmly in itself, and in which there are logic and mathematics with the adaptability and malleability of strength and chords. The Englishman should be proud that his language indicates an epic of human history. One can show forth its origin; and all layers can be distinguished in it, which gathered together during contacts with different nations. Whereas the Hungarian language is like a rubble-stone, consisting of only one piece, on which the storms of time left not a scratch. It's not a calendar that adjusts to the changes of the ages. It needs no one, it doesn't borrow, does no huckstering, and doesn't give or take from anyone. This language is the oldest and most glorious monument of national sovereignty and mental independence. What scholars cannot solve, they ignore. In philology it's the same way as in archeology. The floors of the old Egyptian temples, which were made out of only one rock, can't be explained. No one knows where they came from, or from which mountain the wondrous mass was taken. How they were transported and lifted to the top of the temples. The genuineness of the Hungarian language is a phenomenon much more wondrous than this.ā
1840
N. ERBESBERG, a world famous professor from Vienna: āThe structure of the Hungarian language is such that it appears that linguists could have created it with the purpose of incorporating in it every rule, conciseness, melody and clarity and besides all this it avoided any commonness, difficulty in pronunciation and irregularities.ā
1848
N. SIMPSON: āLetters from the Banks of the Danube.ā In this series of articles, he wrote about the Hungarian language in the exciting days of March, (during the 1848 Hungarian Freedom Fight against the Hapsburgs). āThe Hungarian language is very poetic, rich and spirited, . . . it is full of enthusiasm and strength and is suited to all kinds of poetical work. It is strong and yet gentle and very pleasing in sound. It is melodic and its expression is clear.ā
1840
WILHELM SCHOTT, an outstanding German scientist: ā In the Hungarian language there is a fresh, childish, natural view and it cannot but be suspected that there is the possibility of development hidden in it like a bud. It contains many beautiful soft consonants and its vowels are more clearly pronounced than in German. It can be used for short statements and also for powerful oratory, in short, every type of prose. It is built on matching vowel sounds, pleasing rhymes, and its richness and resounding tones are well suited for poetry. This is demonstrated in every branch of poetry.ā
1932
EDGAR CLEMENT, German linguist, was so impressed by the musicality of the language that he learned Hungarian. According to him, the Hungarian language had a magical strength, which reflected a deep spirituality and only the highest ranking languages, especially the old classical languages could match up to it."
Ove Berglund; Swedish physician and translator:
"Now that I have an idea of the structure of language, it is my opinion: the Hungarian language is the top product of human logic." (Hungarian National 2003rd XII.)
Edward Teller; Nuclear physicist:
"... Excellent new discovery that ONE language is, that is the Hungarian." (Mai Nap, Budapest, 1991. 9)