1959-1961: Genocide pushes an estimated 200,000 Rwandans, mainly Tutsis, to flee to Uganda.
1981: Many Tutsi refugees joined National Resistance Army (NRA) guerrilla war that brought President Museveni to power in 1986.
1990: Senior NRA officers of Rwandan extraction, including President Kagame, breaks ranks to launch own rebellion and seize power in Kigali.
1997: Uganda and Rwanda deploy troops to topple then Zaire President Mobutu Sese Seko, but fought one another twice.
2000: Tension rises over alleged counter-subversive activities, including the People’s Redemption Army rebel group.
2010: Bilateral and diplomatic relations strain again.
2017: Tension brews afresh, with allegation of infiltration of Uganda’s security and intelligence.
2018: Rwandans arrested over alleged espionage and Refugees minister Hilary Onek threatens that Uganda would deport Rwandan refugees for overstaying their welcome.
2019: Rwanda closes Katuna/Gatuna border to vehicles from Uganda, citing road works. Foreign minister Richard Sezibera in a tweet stops Rwandan citizens from crossing to Uganda, claiming harassment and torture.