BANGKOK, Thailand -- Thailand and Cambodia reaffirmed their shaky ceasefire violation after days of fighting along their border, as China stepped into negotiate with the two countries.

Cambodia and Thailand agreed to an "immediate and unconditional" ceasefire Monday after five days of intense fighting along their shared border. The ceasefire, negotiated in Malaysia with involvement from the U.S. and China, took effect at midnight.

Thailand accused Cambodia of a "flagrant violation" of a truce deal to end cross-border fighting, claiming Cambodian troops launched an overnight attack on the frontier.