DMK Chief M Karunanidhi on Sunday said that the unity between the UPA and Left parties should not be disrupted over the latter's opposition to the Indo-US nuclear deal, as it would affect the nation's progress.

Emerging from Karunanidhi's residence after a 40-minute meeting with him and CPI leader D Raja, Karat told reporters that the chief minister had told them that the disruption would only pave the way for 'communal forces' to gain the upper hand.

Karat said they had assured Karunanidhi that the Left parties would meet again to find a solution to the Indo-US nuclear deal.

"We will meet Karunanidhi again," he said.

Karat said they had put forth the Left parties' views on the UPA government's move to go ahead with negotiations with the IAEA board of governors on the safeguards agreement.

"We are against it. We have explained to him our stand. As a senior leader of the UPA, Karunanidhi will take up the issue with the Congress," he said.

"We have assured him that the Left parties will discuss the matter and come out with a solution," he said.

On the Indo-Pakistan-Iran pipeline, he said, "We want the negotiations to continue so that the deal is completed".