You can find all over the media claims that Ukraine cannot export their grain (I assume it was last year production since it is too early for the new harvest) because the Russian navy blockaded their ports. The UN is now talking to the Russian authorities to which they alreay made some demands and at the same time there are talks mediated by Turkey, at the high levels, going on.
I am wondering, why should the world listen to the demands of an aggressor nation? Ukraine has a long border with Poland, Romania and a other European countries. Couldn't just bypass the blockade? I assume that transporting grains by train is more expensive. But transporting the grains to the ports on the Danube in Romania is not a long leg. From there it could be loaded on barges going towards Europe or in some ports could be loaded on sea going vessels and reach the Black sea on the other side of the blockade.
Why is everyone turning a blind eye on such simple solution?
Judging from the answers by @Federico and @Fizz it seems I have to repeat that we are talking about last year harvest that is being exported in small batches over a long period of time.