The men, aged 21, 28 and 23, appeared before the ACT Magistrates Court today on charges of assault, obstructing territory officials and possession of an offensive weapon.

Police said officers drew a firearm and a Taser and used capsicum spray to force their way into a unit during the incident.

Officers went to a Belconnen unit about 6.50pm on Thursday after receiving reports of a disturbance.

Police entered the unit but allege two men grabbed an officer and forced him into the stairwell then tried to close the door, leaving a second officer inside.

The ejected officer then forcibly regained entry by using capsicum spray.

Police allege one threatened one officer with scissors, but backed down when the officer drew a Taser and firearm.

All three men were arrested and taken to the ACT watch house where they were charged with common assault and obstructing a territory public official.

One was also charged with possessing an offensive weapon.

Another entered a plea of not guilty.

Defence lawyer Paul Edmonds argued police unlawfully entered the property and his client had used reasonable force to eject a trespasser from the premises.

One is set to reappear on February 14, while the other two will reappear on December 14.