He said the rebels wanted to preserve "goodwill" for the talks but "shall be obliged to respond" if the Congolese army continues to launch attacks.
Hamuli declined to comment on M23's allegations, saying the rebels were "agitators."
The M23 fighters launched their rebellion last year and in November briefly overtook Goma, a strategic city along the Rwanda border that is home to nearly 1 million people. The rebel group is made up of hundreds of Congolese soldiers mostly from the Tutsi ethnic group who deserted the national army last year after accusing the government of failing to honor the terms of a deal signed in March 2009. Even before the creation of the M23 in 2012, eastern Congo's forest-covered hills have harbored other rebel groups, ethnic militias and renegade units of the regular army.
An upsurge in violence in late August raised fears of another attempt on Goma. At the time, Congolese troops backed by U.N. forces battled M23 rebels near Goma in clashes that threatened to escalate into a regional border war after Rwanda complained that missiles had been fired into its territory. The rebels are widely believed to be backed by Rwanda, which denies the charges despite multiple U.N. reports citing evidence to the contrary.
Rwandan President Paul Kagame told a news conference in the capital, Kigali, on Tuesday that allegations of Rwandan military support for M23 have been "fabricated."
"Rwanda is not behind the problems in (Congo) but whatever happens in (Congo) spills over to Rwanda," Kagame said. "We have no capacity to control what is happening inside (Congo), but what we have no doubt about is the ability to protect our territory."
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Muhumuza reported from Kampala, Uganda. Associated Press reporter Saleh Mwanamilongo in Kinshasa, Congo, contributed to this report.