Ukraine`s protests ousted pro-Russian President Viktor Yanukovych in 2014.
Russia has since annexed Ukraine`s Crimea peninsula and is accused of backing rebels in eastern Ukraine.
The Ukrainian government, Western leaders and Nato say there is clear evidence that Russia is helping the rebels with heavy weapons and soldiers. Independent experts echo that accusation. Moscow denies it, insisting that any Russians serving with the rebels are "volunteers".
More than 5,400 people have died since the fighting erupted last April.
`Come, if you like your country!`
Russians are expected to come to Moscow from across the country for the "anti-Maidan" march - a reference to Ukraine`s pro-EU protests that started on Kiev`s central Independence Square, widely known as the Maidan.
Ahead of the Moscow rally, Russian state-run media urged all those who considered themselves "patriots" and were against "revolutions" to attend.
"Come, if you like your country!" Rossiya 24 TV channel said in its broadcasts.
The demonstration comes a day after Ukrainian President Petro Poroshenko accused Russia of direct involvement in the sniper fire that killed dozens of protesters in Kiev on 18-20 February last year.
Speaking at a commemorative gathering in Kiev, he said Russian presidential aide Vladislav Surkov had organised "groups of foreign snipers". The president cited information he had received from Ukraine`s security services.
The Russian foreign ministry hit back at the claim, calling it "nonsense".
The anti-Yanukovych revolt was triggered by a sudden U-turn that ditched a wide-ranging pact with the EU in favour of closer ties with Russia.
Rebel advance
Mr Poroshenko was speaking just two days after his army retreated from the key town of Debaltseve, now in rebel hands.
The rebels took the strategic transport hub, despite a ceasefire deal signed on 12 February.
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