Poland and the Baltic states have demanded the European Union strengthens its eastern border, warning of a ‘looming threat’ from Russia and Belarus along its 1,500-mile border with the East. 

The four EU members are staunch allies of Ukraine, which has been fighting a fully-fledged Russian invasion for more than two years.

They are trenchant critics of Moscow, who they accuse of orchestrating hybrid attacks including ‘intimidation, instrumentalisation of migrants, sabotage, disinformation, foreign information manipulation and interference, (and) cyber-attacks’.

In their letter, the leaders of Poland, Estonia, Latvia and Lithuania…