Experts say several other countries have also mobilised reserves during past engagements when wars lasted longer than expected.
As the countdown to regional elections begins, the Russian economy shows no positive signs and Moscow’s close ally of Belarus descends into political chaos.
President Vladimir Putin's changes, which have been approved by both houses of parliament, would overturn a current constitutional ban on him running for president again in 2024, allowing him to potentially stay in power until 2036.
Constitutional changes allowing Vladimir Putin to run for president again in 2024 sail through both houses of parliament, raising prospect he could clock up over three decades in Kremlin and rule longer than Soviet leader Joseph Stalin.
Protests erupted in the Russian capital Moscow in mid-July after the Central Election Commission refused to register a large numbers of opposition-minded candidates.
In recent weeks, thousands have attended street protests calling for free and fair elections after the exclusion of several opposition figures from local Moscow polls next month.
Russian opposition is demanding free elections, after authorities disqualified a number of opposition candidates from the upcoming local polls due in September.
Prominent Russian opposition leader Alexei Navalny has been transferred from hospital back to jail to carry out the rest of his 30-day sentence while his own doctor fears he may have been poisoned.
Demonstrators were rallying against the exclusion of several opposition candidates from the ballot for this fall's Moscow council elections.
Russian opposition leader Alexei Navalny has been sentenced to 30 days in jail by a Moscow court as he was found guilty of breaking the law by organising an unauthorised Moscow rally on January 28.
Navalny, who has been detained and jailed several times for organising similar protests, was barred from running in Russia's presidential election in March.
Critics of Vladimir Putin took to the streets of Russia ahead of his inauguration for a fourth presidential term to register their opposition to what they say is his autocratic Tsar-like rule.
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