Sir Keir Starmer said he would not be “deflected” by Labour rebels after he stripped the whip from several MPs. The Prime Minister suspended the whip from Rachael Maskell, Neil Duncan-Jordan, Brian Leishman and Chris Hinchliff.

The landmark treaty builds on a defense pact the U.K. and Germany, two of the biggest European supporters of Ukraine, signed last year committing to closer co-operation against the growing threat from Russia.