@HeinzGud A crash course in Sri Lanka's system of governance and politics would be much appreciated.
The article above was Greek to me.
Well here goes. Hope this would clarify the situation.
Sri Lanka initially had two main political parties. The UNP and SLFP. UNP being center right and SLFP being center left. UNP ruled the island from 1948-1956 then 1965-1970 then 1977-1994. SLFP ruled the gaps with coalition parties. This time around a new far left political party was created called JVP (PLF) which aimed to gain power through armed rebellion. They orchestrated two clandestine coup in 1971 and 1988 which was severely crushed by the then governments with iron fist. Many people died during those purges specially youngsters. JVP later absorbed into the democratic political stream with rehabilitated former rebels and shape them selves with leftist ideologies.
It was the UNP which introduced open economic model back in 1977 and went closer to US sphere of influence triggering India to intervene in Sri Lankan affairs. Amid the chaos of war and destruction UNP was finally defeated in 1994 under the leadership SLFP promising end to the war and abolition of presidency.
However, after series of let downs by the SLFP leadership UNP were able to garner back power in 2002 but only in the parliament. (Presidency was under the SLFP). It was this time that the Norwegian backed ceasefire was signed and the destructive war was halted for the time being.
This uneasy ceasefire led Sinhalese people rally behind SLFP and JVP which by now was seen as viable bulwark against rampant corruption and nationalist ideologies. 2004 they contested under the UPFA badge and won the majority seats in the parliament. The victory of the UPFA paved the way for the rise of Rajapakse and his illustrious 10 year tenure. By this time JVP had left UPFA under various differences and acted as independent pressure group in the parliament.
In 2010 just after the war victory Rajapakse had called for a fresh presidential election (under UPFA banner) and UNP now severely weakened by their political agendas seeked a coalition to counter Rajapakse. UNP and JVP joined together to present a common candidate in 2010. However, Rajapaksa won that election resoundingly.
In 2015 amid the escalating living costs and international pressure in UNHR, Rajapakse again called for an presidential election to secure his political position. UNP again seeked JVP's support to field a common candidate to face Rajapakse. The common candidate was turned out to be UPFA's general secretary. This time the gamble paid off and the Rajapakse was defeated.
This presented a unique political situation and the winning candidate the former UPFA general secretary tried to hijack UPFA leadership from Rajapakse. With the new found political leverage he formed a new government with UNP and part of UPFA members. The rest of UPFA MPs remained with Rajapakse forming a opposition group. JVP didn't partake in the new government as they sought their own mandate in the political field now had left directionless.
In 2015, the new president called for parliament election to form a secure and stable government. This time UNP and JVP contested alone while the UPFA amid political crisis joined hands to prevent their voter base from dividing though the president actively objected to Rajapakse becoming prime minister. After backstabbings and political infighting UPFA could muster considerable number of seats in the parliament which left UNP with unstable majority.
However, this time the president intervened again and forcibly joined UPFA and UNP together to form a unity government with 2/3 majority. Though Rajapakse loyalists had protested and formed their own opposition group which unfortunately was not officially recognized by the UNP elected speaker of the parliament.
This political quagmire led to the down trodden Rajapakse loyalists to from a break a away political party called SLPP to challenge the combined strength of both UNP and UPFA. That is what happened few days back with a landslide victory to the SLPP.