UPDATE 1-Russia says Ukraine shells its positions during Moscow's unilateral ceasefire

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Jan 6 (Reuters) - Russia said Ukraine shelled Russian military positions on Friday during a 36-hour ceasefire unilaterally declared by President Vladimir Putin, which Kyiv and its allies have dismissed as a sham.

The Russian defence ministry said that its positions had come under attack in the Luhansk, Donetsk and Zaporizhzhia regions, but that its troops were observing the ceasefire.

"Four mortar shells were fired at Russian positions by the Armed Forces of Ukraine in the direction of Lyman," it said.

Reuters could immediately establish if there had been any lull in fighting. Kyiv has said it has intention of halting fighting for the proposed Russian ceasefire, which Ukraine and its Western allies called a ploy designed to give Moscow time to reinforce troops and equipment.

Putin ordered the 36-hour ceasefire in the 10-month-long war in a surprise move on Thursday, saying it would mark the Russian Orthodox Christian Christmas.

(Reporting by Reuters
Editing by Mark Heinrich and Peter Graff)