(Recasts with new comments, bonds, Serbian outlook)     * Slovenian assets fall as PM expected to quit     * Fall of government could delay economic reforms     * Ukraine crisis still weighs on regional sentiment     * Dinar flat, investors optimistic over new Serbian govt      By Zoran Radosavljevic and Sandor Peto     BUDAPEST, April 28 (Reuters) - Slovenian stocks and bonds plunged on Monday after Prime Minister Alenka Bratusek lost the leadership of the ruling party in a weekend vote, casting doubt over her government's survival.     Bratusek will announce on Tuesday whether she plans to stay on as prime minister, but she is widely expected to resign after a congress of her Positive Slovenia party elected Ljubljana Mayor Zoran Jankovic to replace her as leader.  
  ID:nL6N0NH55V
       Some other Central European assets also eased as the crisis in Ukraine weighed on sentiment in financial markets.     Slovenia's main share index  
  .SBITOP
   was down 4.65 percent by 1025 GMT, after falling more than 5 percent in early trade.     Telekom Slovenija  
  TLSG.LJ
   and retail company Mercator  
  MELR.LJ
   both fell almost 7 percent, even though the latter said on Friday that it had reached a deal with its creditors on restructuring its debt, clearing the last hurdle for its takeover by Croatian food and retail concern Agrokor.        Slovenian 10-year government bond yields  
  SI10YT=RR
       jumped 24 basis points from Friday to 3.94 percent.     "Obviously, the latest political instability is playing a role, but I don't expect anything really dramatic," one bond  trader said.     With its borrowing needs covered for 2014, the ex-Yugoslav republic looks unlikely to have to resort to outside help even if the government collapses. But its fall could delay planned budget cuts and privatisations aimed at reviving the economy.     If Bratusek resigns, Slovenia's President Borut Pahor, political parties and parliamentary members will try to agree a new candidate for prime minister, a process likely to take several weeks and expected to end in failure. Only then can a new election be scheduled.     "The prospect of a long period of lame duck administration, damaging the privatisation process and storing up of problems on the fiscal and reform side, will likely mean the challenge for 2015 is now all the greater even at a time when many had considered the outlook to be more rosy," Nomura analyst Peter Attard Montalto said in a note.     Slovenia had to pump 3.3 billion euros ($4.6 billion) of its own funds into its troubled banks late last year to avert the need for an international bailout and prevent a market meltdown. It had been the fastest-growing euro zone member in 2007 but was badly hit by the global financial crisis in 2008-2009.           SERBIA FORMS GOVERNMENT     Ex-Yugoslav states are still struggling to reform state finances, but the region's economies are generally more balanced than many other emerging markets, and prospects of a recovery in growth buoyed their assets in the past several weeks.     In the past week, concerns over neighbouring Ukraine's crisis have weighed on asset prices in the region.     Stocks in the region rebounded from morning falls by midday on Monday, tracking a rise in Western European equity markets. However, there were persistent concerns about developments in Ukraine, where pro-Moscow rebels in the east showed no sign of curbing their uprising, seizing public buildings in another town, and the United States announced new sanctions against some Russians.  
  ID:nL6N0NK29P
       Those concerns pushed Hungarian government bond prices lower, with 10-year yields rising 13 basis points to 5.69 percent.            The dinar  
  EURRSD=
   was little changed after Serbia's new cabinet was sworn in on Sunday, with Prime Minister Aleksandar Vucic pledging painful economic reforms as expected.     Serbia, an ex-Yugoslav state ravaged by wars and political wrangling since 1990, is still struggling to reform its economy and join the European Union.     "In my opinion Serbia still has the potential to be the new reform darling of the region, taking the mantle from Romania, but it is so important this time around to secure the anchor of an IMF programme," Timothy Ash of Standard Bank said in a note.      Vucic pledged to save 1.5 billion euros a year. To get a needed cash injection the government will sell a stake in state-owned firms such as telecommunications company Telekom Srbija and power utility Elektroprivreda Srbije (EPS).       "This week we expect the EUR/RSD (the dinar) to continue trading within a narrow range," Hypo Alpe Adria said in a note.     "Even though we see upside EUR/RSD risks due to the remaining fiscal uncertainties, global markets' volatility and the private sector's external de-leveraging, there definitely is some optimism over the new government's reform agenda."                       CEE MARKETS SNAPSHOT AT 1216 CET  ************************** CURRENCIES ************************                              Latest  Previous   Daily   Change                              bid     close      change  in 2014  Czech crown      
  EURCZK=
     27.442    27.417   -0.09%  -0.40%  Hungarian forint 
  EURHUF=
    309.280   309.840  +0.18%  -3.98%  Polish zloty     
  EURPLN=
      4.207     4.205    -0.05%  -1.37%  Romanian leu     
  EURRON=
      4.451     4.447   -0.09%  +0.20%  Croatian kuna    
  EURHRK=
      7.610     7.611   +0.01% +0.10%  Serbian dinar    
  EURRSD=
    115.620   115.700   +0.07%   -0.97%  Note: daily change calculated from previous close at 1600 GMT  **************************** STOCKS **************************                              Latest  Previous   Daily   Change                                      close      change  in 2014  Prague             
  .PX
       992.64    992.76   -0.01% +0.58%  Budapest          
  .BUX
     17585.78  17571.41   +0.08%   -4.08%  Warsaw          
  .WIG20
      2444.55   2429.80   +0.61% +1.67%  Bucharest        
  .BETI
      6411.75   6417.32   -0.09%   -1.02%  ***************************** BONDS **************************                          Yield    Yield    Spread    Daily                          (bid)    change   vs Bund   change in  Czech Republic                                      spread    2-year    
  CZ2YT=RR
     0.285   +0.031   +10bps    +2bps    5-year    
  CZ5YT=RR
     0.896     -0.032   +30bps      -4bps   10-year   
  CZ10YT=RR
     1.890    -0.050   +40bps     -6bps  Hungary    3-year    
  HU3YT=RR
     4.330    +0.030   +407bps   +2bps    5-year    
  HU5YT=RR
     4.650    +0.080   +405bps   +7bps   10-year   
  HU10YT=RR
     5.690   +0.130    +420bps   +12bps  Poland    2-year    
  PL2YT=RR
     2.980    -0.020    +280bps    -3bps    5-year    
  PL5YT=RR
     3.490    0.000    +289bps    -1bps   10-year   
  PL10YT=RR
     4.110   -0.010    +262bps    -2bps  ******************* FORWARD RATE AGREEMENTS ******************                               3x6     6x9    9x12  3M interbank  Czech Rep  
  CZKFRA
   
  PRIBOR=
    0.400   0.470  0.500   0.37  Hungary    
  HUFFRA
   
  BUBOR=
     2.750   2.875  3.010   2.65  Poland     
  PLNFRA
   
  WIBOR=
     2.750   2.750  2.850   2.72  Note: FRA quotes are for ask prices  **************************************************************    (Additional reporting from Ivana Sekularac in Belgrade; Editing by Susan Fenton)  ((sandor.peto@thomsonreuters.com)(+36 1 327 4744)(Reuters Messaging: sandor.peto.thomsonreuters.com@reuters.net))  
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