The Kremlin on Thursday cautioned against "hypotheses" over the crash of an Azerbaijani plane which had been due to land in Russia as experts pointed to possible evidence of a missile explosion.

The Russian operator of a cargo ship that sank in the Mediterranean Sea between Spain and Algeria said Thursday that it had been hit by a series of explosions in an act of sabotage.

Oboronlogistica, a state-controlled company that operated the Ursa Major freighter, said it was wrecked by three powerful explosions just above the water line in what it described as a "terrorist attack" that caused it to sink.

Russia's top security agency said Thursday that it has arrested several suspects accused of involvement in an alleged Ukrainian plot to assassinate senior military officers, an announcement that follows the killing of a top Russian general last week.

The Federal Security Service, a top KGB successor known under its Russian acronym FSB, said in a statement carried by Russian news agencies that it had arrested four Russians accused of making preparations to kill senior Defense Ministry officials.

Ukrainian President Volodymyr Zelensky denounced Wednesday an "inhumane" attack from Russia, which launched over 170 missiles and drones, knocking out power in several regions on Christmas Day and killing an energy worker.

Pakistan air strikes in an eastern border province of Afghanistan killed 46 people, the Taliban government spokesman told AFP on Wednesday, as the defense ministry vowed retaliation.

An Azerbaijan Airlines passenger jet with 67 people on board crashed on Wednesday in western Kazakhstan after veering from its scheduled route, officials said.

President Joe Biden announced on Monday that he is commuting the sentences of 37 of the 40 people on federal death row, converting their punishments to life imprisonment just weeks before President-elect Donald Trump, an outspoken proponent of expanding capital punishment, takes office.

The move spares the lives of people convicted in killings, including the slayings of police and military officers, people on federal land and those involved in deadly bank robberies or drug deals, as well as the killings of guards or prisoners in federal facilities.

Mourners laid flowers near the scene of the deadly Christmas market attack on Monday as investigators puzzled over the motive of the suspect and fears swirled that the rampage could deepen divisions in German society.

The Johanniskirche, a church a short walk from the scene of the attack, has become a central place of mourning since the suspect drove a car into the busy market on Friday evening, killing five people. A carpet of flowers now covers the broad sidewalk in front of the church.

France marked a national day of mourning Monday for the victims of Cyclone Chido, which devastated the French overseas department of Mayotte earlier this month. Flags were flown at half-staff across the country, and a minute of silence was observed.

The cyclone, the most destructive to hit Mayotte in 90 years, caused extensive damage to the island, known as France's poorest territory, and left 35 dead and around 2,500 injured. The actual toll is likely much higher due to the widespread destruction of infrastructure and precarious living conditions.

Iran's supreme leader denied Sunday that militant groups around the region functioned as Tehran's proxies, warning that if his country chose to "take action", it would not need them anyway.

The remarks came after a year in which Iran-backed Hezbollah in Lebanon and Hamas in Gaza suffered heavy losses in wars with Israel, and two weeks after the fall of Syrian president Bashar al-Assad, who had been a key link in Tehran's so-called axis of resistance.