• Nominations to Austria from Slovakia up 21% from Monday
• Gazprom says gas exports via Ukraine to Europe stable
• Gazprom halted flow to Austria’s OMV in mid-November

MOSCOW/PRAGUE, Nov 26 (Reuters) - Russian gas exports via Ukraine to Europe were stable on Tuesday while nominations for supply to Austria from Slovakia jumped by 21%, data from Gazprom and transmission system operator Eustream showed.