<Tr> <Td> September 8 - 12 </Td> <Td> Russia: General Kornilov's coup attempt fails . </Td> <Td> Details </Td> </Tr> <Tr> <Td> September 12 </Td> <Td> Alexandre Ribot resigns as Prime Minister of France; he is replaced by Paul Painlevé . </Td> <Td> </Td> </Tr> <Tr> <Td> September 14 </Td> <Td> Russia declared a republic . </Td> <Td> </Td> </Tr> <Tr> <Td> September 20--26 </Td> <Td> Battle of the Menin Road Ridge (Second phase of the Third Battle of Ypres). </Td> <Td> </Td> </Tr>

When did russia enter the first world war