In 1991, the Soviet Union broke apart and Armenia re-established its independence. Declaring independence on August 23, it was the first non-Baltic republic to secede. However, the initial post-Soviet years were marred by economic difficulties as well as the break-out of a full-scale armed confrontation between the Karabakh Armenians and Azerbaijan. The economic problems had their roots early in the Karabakh conflict when the Azerbaijani Popular Front managed to pressure the Azerbaijan SSR to instigate a railway and air blockade against Armenia. This move effectively crippled Armenia's economy as 85% of its cargo and goods arrived through rail traffic. In 1993, Turkey joined the blockade against Armenia in support of Azerbaijan.