Volodymyr Zelensky has said giving up land for peace in a future agreement with Russia could be 'impossible'.

Speaking in Brussels today, the Ukrainian president insisted that his country's constitution made it 'impossible to give up territory or trade land'.

But he went on to say: 'Since the territorial issue is so important, it should be discussed only by the leaders of Ukraine and Russia at a trilateral meeting.'

'We need real negotiations, which means we can start where the front line is now,' Zelensky said, adding that European leaders supported this.

It comes as US president Donald Trump appears poised to urge the Ukrainian leader to agree to a Russian land grab of his country's territory.