The detention of General Emmanuel Karake Karenzi will strain relationships between Rwanda and the UK. He is expected to go before a court on Thursday.
Congolese warlord Bosco Ntaganda, known as "The Terminator", hands himself into the US Embassy in the Rwandan capital.
The halting of aid to Rwanda is "Britain throwing down the gauntlet", writes Foreign Correspondent Jonathan Miller who investigated alleged military interference in Congo for Dispatches on Monday.
Britain is withholding £21m of aid to Rwanda amid concerns that the state is supporting rebels in the Democratic Republic of Congo (DRC), it was announced today.
Former chancellor Lord Lawson condemns the Conservative-led coalition's rising aid payments to Rwanda, a country which he says is run by "an unscrupulous monster", writes Jonathan Miller.
Exclusive: A former ally of the Rwandan president warns that British aid is bankrolling an unaccountable, repressive regime accused of war crimes in neighbouring Congo, writes Jonathan Miller.
Channel 4 News plots the chronology of major incidents in Rwanda since 2010. Many other attacks on democratic freedoms and threats against individuals have taken place.
The Foreign Office had been reluctant to blame President Kagame's government for the surge in fighting in the east of the DR Congo. That changed when it emerged Rwanda was behind the M23 rebel group