That Corbyn fella...

Stop The War statement on Ukraine - it calls for NATO to stop its expansionism, but does not call for Russia to do the same

The statement literally says:

Stop the War believes that Russia and Ukraine should reach a diplomatic settlement of the tensions between them, on the basis of the Minsk-2 agreement already signed by both states.

Minsk II calls for (amongst other things):

Restore full control of the state border by the government of Ukraine.

Withdrawal of all foreign armed formations, military equipment and mercenaries.

But this is probably just a mealy mouthed secret invitation for Russia to invade Ukraine.