Rwanda has put $1bn of global aid under threat by taking part in the invasion of the Democratic Republic of the Congo, the UK foreign secretary, David Lammy, has said.

He made the direct warning in a phone call to the Rwandan president, Paul Kagame, on Sunday after also speaking to the US secretary of state, Marco Rubio, about the crisis.

Lammy said Rwanda received more than $1bn of global aid every year, including about £32m of bilateral UK assistance.

“All of that is under threat when you attack your neighbours, and we are clear that we cannot have countries challenging the territorial integrity of other countries. Just as we will not tolerate it in the continent of Europe, we cannot tolerate it wherever in the world it happens. We have to be clear about that,” Lammy said.