BEIJING, Feb. 26 -- Compatriots from across the Taiwan Strait should be vigilant against Japanese proposals that may interfere with cross-Strait affairs and alienate relations between the two sides, a mainland spokesman said on Wednesday.

Ma Xiaoguang, State Council Taiwan Affairs Office spokesman, made the remarks when answering a question on the island's opposition Democratic Progressive Party's positive response to a Japanese proposal on a "Taiwan relations law."

Ma expressed hope that the two sides maintain peaceful development of cross-Strait ties.

At the press conference, Ma said the mainland has always insisted on cross-Strait cooperation in relation to waters surrounding the East China Sea and South China Sea.

As to Taiwan's leader Ma Ying-jeou calling on relevant parties to solve airspace disputes over the East China Sea in a peaceful way, Ma Xiaoguang said both sides of the Strait are of one family and it is a common responsibility to safeguard the fundamental interests of the Chinese nation.