US President Donald Trump has told his Nato allies in Brussels that all members of the alliance must pay their fair share of defence spending. <br/><br/>He voiced his long held concern that alliance members are not paying enough. President Trump said that bombing of a pop concert in the British city of Manchester on Monday, claimed by the Islamic State group, showed that terrorism must be stopped in its tracks. <br/><br/>He said that the NATO of the future must include a great focus on terrorism and immigration. <br/><br/>German Chancellor Angela Merkel struck an entirely different note as she unveiled a memorial made up of a section of the Berlin Wall to mark the end of the Cold War. She said Germany will not forget the contribution of NATO in reunify Germany. <br/><br/>Therefore, Germany will indeed makeour contribution to security and solidarity in the common alliance.<br/><br/>Trump's rebuke came despite NATO saying it would formally join the US-led coalition against IS at the summit, despite reservations in France and Germany about getting involved in another conflict. <br/>