One of two men charged with the murder of Russian politician Boris Nemtsov is a former senior policeman from Chechnya, Reuters reports.
Zaur Dadayev is said to have confessed to involvement in the crime.
Five men appeared in court today in relation to Mr Nemtsov's killing in Moscow. Judge Natalia Mushnikova ordered that all five men should remain in custody.
Chechen leader Ramzan Kadyrov, a Putin ally, said Dadayev, was a pious Muslim who had been angered by cartoons of the Prophet Mohammad in the French satirical newspaper Charlie Hebdo.
Kadyrov described Dadayev as "a true patriot of Russia" who had received several medals for bravery but had subsequently resigned from his interior ministry regiment for reasons the Chechen leader said were unclear.
One of the suspects charged with the murder of Russian opposition leader Boris Nemtsov has admitted to his role in the killing, a court has heard.
The judge, sitting at Moscow's Basmanny court, said Zaur Dadayev had confessed to investigators that he was involved in shooting Nemtsov four times in the back as he crossed a bridge in the city last week.
He was remanded in custody until April 28.
Three other suspects have also been detained in connection with the killing, while the court has yet to make a decision on whether to detain a fifth man, Anzor Gubashev, who has also been charged with involvement in murder.
Two suspects have been charged with involvement in the murder of Russian opposition leader Boris Nemtsov, a spokeswoman for the Moscow Court has said.
Anzor Gubashev and Zaur Dadayev were due to appear in court today charged with killing the vocal Kremlin critic, who was shot four times in the back as he crossed a bridge in Moscow last week.
Three others have also been detained in connection with his death.
The relationship between Russia and the UK could be "prickly" for many years to come as the crisis in Ukraine continues, the Foreign Secretary has warned.
Speaking on the BBC's Andrew Marr show, Philip Hammond said Britain was prepared to escalate sanctions against Moscow if the Russia-backed separatists in Ukraine did not abide by the terms of the latest ceasefire.
He said under the rule of President Vladimir Putin, Russia had moved from being a partner of the West to viewing Europe as its "adversary" - and said he did not believe there was a "military solution" to the situation in Ukraine.
We have all made clear that if there is a big assault, for example on Mariupol, that will be responded to with a significant increase in the economic pressure on Russia from the EU.
Russia has decided that it wants to be in a strategic competition with the West, with Europe. It doesn't any longer see us as partners, it sees us as competitors or even adversaries and that means that we are going to have a difficult, prickly relationship with Russia probably for some time to come.
We don't think there can be a military resolution to this crisis. The disparity between the size of the Ukrainian armed forces and the Russian armed forces doesn't make that a sensible way to go.
We have to insist that the rules-based system which says very clearly that you can't change international boundaries by force, is protected.
Two more murder suspects have been detained by police in Russia over the death of vocal Kremlin critic Boris Nemtsov, Agence France-Presse reports.
The men, reportedly both from the Chechnya region, are being questioned alongside two others arrested yesterday.
Former Prime Minister Nemtsov, aged 55, was shot four times in the back as he crossed a bridge in Moscow last week.
Two suspects have been detained over the murder of Russian opposition leader Boris Nemtsov, the Interfax news agency reports, citing the head of the country's federal security service.
Open Kremlin critic Nemtsov, 55, was shot four times in the back as he crossed a bridge in Moscow last week.
Russian President Vladimir Putin is take a 10% pay cut, Agence France-Presse reports.
The earnings of several other top officials will also be cut. Russia is still reeling from the collapse of the ruble.
The wage reduction also applies to all of those employed by the presidency and the council of ministers affected.
Kremlin critic Alexei Navalny has been released from prison after serving 15 days.
His release comes on week after Russian opposition leader Boris Nemtsov was shot dead in what his allies say was a political killing.
Navalny was released after serving 15 days for handing out leaflets in the Moscow metro to promote a protest rally that had been planned on March 1.
The planned rally turned into a mourning march instead for Nemtsov, a former deputy prime minister. He was shot late in the evening on Feb. 27 within sight of the Kremlin walls.
Foreign Secretary Philip Hammond has said sanctions on Russia must remain in place and warned further sanction were possible if Russia does not comply with the Minsk agreement.
"The European Union will remain united on the question of sanctions, sanctions must remain in place until there is full compliance," Hammond said at a joint conference with his Polish counterpart in Warsaw.
"We will prepare possible new sanctions, which could be imposed quickly if there is further Russian aggression of if the Minsk agreement is not complied with," Hammond said.