The meeting on Monday will see Mr Macron and Sir Keir joined by leaders from Germany, Italy, Poland, Spain, the Netherlands and Denmark along with the presidents of the European Council and European Commission and the secretary general of Nato.
The Sunday Times reported that Sir Keir held one-to-one meetings on Friday with the Chief of the Defence Staff Admiral Sir Tony Radakin amid calls for higher defence spending.
The Prime Minister will join European leaders at an emergency summit called by Emmanuel Macron on Monday, as they consider how to respond to Mr Trump's push for an end to the war in Ukraine.
Sir Keir Starmer will act as a “bridge” between Donald Trump and Europe ahead of an emergency summit on an end to the Ukraine war on Monday, ministers have vowed.
Trump has pledged talks with Vladimir Putin to end the war in Ukraine, with US officials on Sunday attending a meeting with Russian officials to discuss the war.
