Two knife-wielding assailants tried to enter a police station in Chechnya's Shalinsky district and attacked and wounded two police officers, investigators said.
A Russian court on Thursday jailed a teenaged supporter of the Islamic State jihadist group over a plot to carry out a suicide attack at Saint Petersburg's Kazan cathedral.
More than 300 people including around 100 foreigners have been sentenced to death for belonging to Islamic State.
A London teenager was jailed for life on Friday for plotting a terror attack, becoming the youngest woman to be sentenced for terrorism offences in Britain.
The nine suspects were each handed 101 life sentences, the state-run Anadolu news agency said.
The move is a response to the attack by an armed gang on a group of seven foreign cyclists on Sunday.
More than 150 Islamic State fighters surrendered in Afghanistan on Wednesday, Afghan officials said, a move which they and the Taliban hailed as the end of the extremist group in the north of the country.
An armed gang attacked a group of seven foreign cyclists, killing four and injuring two, on a popular biking route in the south of the impoverished ex-Soviet nation on Sunday.
Government forces are on the brink of seizing the last part of southwestern Syria in insurgent hands, the Syrian Observatory for Human Rights said on Monday.
A string of suicide blasts and raids claimed by the Islamic State group killed more than 180 people in southern Syria on Wednesday, in one of the jihadists' deadliest ever assaults in the country.