1990: Russia shows interest in Azerbaijan oil and the pipeline in Chechnya.
1991: The fall of the Soviet Union allows Georgia, Latvia, Ukraine, Azerbaijan, Tajikstan and Chechnya to declare independence. Russia refuses to allow Chechnya independence.
1992: Chechnya separated from fellow Muslim province Ingushetia.
1994 November: Chechnyas president Dadaev declares independence. Russias attack to keep Chechnya with 40,000 troops coincides with Boris Yeltsins reelection.
1994 December: Yeltsin decides to invade Chechnya again after embarrassing defeat in November.
1995: Peace treaty signed but sporadic fighting continued.
1996: Dudaev killed. Cease-fire ended fighting.
1997: Peace treaty signed.
1999 August: Radical Muslims stage uprisings in neighboring Dagestan. September
1999: Russia declares full scale war in Chechnya.
1999 November: In effort to surround capitol Grozny, Russian captures neighboring cities.
2000 February: Russia claims it captured Grozny, while Chechen forces flee to Southwest portion of country.
2000 June: Russia appoints Islamic cleric Ashmed Kadyrov to head the separatist state. Kadyrov supported Russian invasion and disliked former Chechen president Maskhadov. Later Russia removes 3/4 of forces from Chechnya.
You left out the invasions into southern Russia, like Buddenovsk.