Is MOEX open on Monday 31 December 2018?
No
No. MOEX is closed on Monday 31 December 2018 for New Year's Eve. It reopens on Thursday 3 January 2019.
New Year's Eve
See also MOEX hours today and MOEX holidays 2018
LSE
Xetra
Euronext Paris
SIX
NYSE
TSX
B3
TSE Tokyo
HKEX