Britain cannot deal effectively with geopolitical crises without rejoining EU, says thinktank

Protesters gather outside the Houses of Parliament to call for the UK to rejoin the EU. Photograph: Vuk Valcic/Zuma Press Wire/Shutterstock

Britain cannot deal effectively with geopolitical crises such as Russian aggression and political turmoil in the US without rejoining the EU, according to an influential thinktank.

The Institute for Public Policy Research has become the latest organisation with ties to the Labour party to call for the UK to re-enter the bloc, after Andy Burnham said he wanted to examine all possible options.