The "preliminary round of talks" between the two parties was held at Chief Minister Oommen Chandy's official residence in Thiruvananthapuram after Congress high command gave the green signal to explore the possibilities of co-operation with RSP, including an electoral tie-up, Congress sources said.
Congress is learnt to have sought an assurance from RSP that it would support UPA at the Centre in return for backing its candidate in Kollam seat.
RSP leaders also made it clear there was no return to LDF and the party would back the UPA at the national level.
Meanwhile, worried over RSP quitting the Left Democratic Front in Kerala ahead of Lok Sabha polls, CPI today asked major partner CPI(M) to show "accommodation" to ensure there is no break in the alliance.
In a letter to Prakash Karat, CPI General Secretary S Sudhakar Reddy said the rift between RSP and CPI(M) in Kerala which led to RSP walking out of LDF and "deciding to contest in Kollam constituency with the the support UDF is matter of serious concern".
RSP, a long-time partner in the LDF, broke off with it yesterday, protesting the overbearing approach of CPI(M) and CPI in seat allocation. The party also decided to put up its former MP N K Premachandran as its candidate in Kollam, its traditional stronghold.
It also rejected the appeal of central leaders of CPI(M) and CPI to reconsider its decision in the larger interests of Left unity.
