Experts say several other countries have also mobilised reserves during past engagements when wars lasted longer than expected.
Recent border clashes killed nearly 100 people from the two neighbouring Central Asian states, signalling their friction could destabilise the entire region.
More than four million tonnes of grain have left Ukrainian ports so far, Turkish President Recep Tayyip Erdogan says, while also stressing the importance of exporting Russian grain and fertilisers to help poor countries.
Mass conscription, intended to enlist 300,000 troops, begins in Russia while Ukrainian President Zelenskyy calls on Russians to resist "partial mobilisation" or "surrender" to Ukrainian army.
UN Secretary-General Antonio Guterres tells the Security Council that Ukraine is increasingly headed "towards an endless cycle of horror and bloodshed," as fighting continues on the 211th day.
"Don't. Don't. Don't. It would change the face of war unlike anything since World War 2," US President Biden tells CBS News, urging Russia's Putin not to use nuclear or chemical weapons in Ukraine.
The two sides have agreed to put the payment model into action in the "near future", says Russian President Putin
The Russian and Chinese leaders speak at the SCO summit in Uzbekistan, which has brought them together with the leaders of several Asian countries.
"Moscow-Beijing tandem" plays "a key role" in ensuring global and regional stability, Russian President Vladimir Putin tells his Chinese counterpart Xi Jinping in Uzbekistan.
Widespread blackouts have affected large areas of the country where Kiev's forces have been making gains in a lightning counter-offensive.
Ukrainian President Volodymyr Zelenskyy announces that his country's army has retaken around "2,000 kilometres of territory" from Russian forces in September.
Turkish President Recep Tayyip Erdogan and his Russian counterpart Vladimir Putin discuss regional issues and bilateral relations over the phone.
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