Russian opposition leader Alexei Navalny and several EU politicians have been barred from attending the funeral of murdered politician Boris Nemtsov in Moscow.
A Polish politician was denied a visa under existing Russian sanctions while a Latvian MEP was turned back after arriving at a Moscow airport.
Alexei Navalny was denied permission to leave jail, where he is serving a 15-day sentence.
Mourners are filing past Boris Nemtsov’s coffin at Moscow’s Sakharov centre.
His funeral will be held in the afternoon at a Moscow cemetery, Troyekurovskoye, where murdered journalist Anna Politkovskayta was buried in 2006.
Boris Nemtsov, a fierce critic of President Vladimir Putin, was killed on a bridge near the Kremlin wall on Friday night.
No arrests have been made and no clear motive has been established for the crime.
New CCTV footage of the presumed getaway car has been released by a pro-Kremlin Russian news website, LifeNews. The video shows a vehicle making its way along Moscow streets but there is no close-up on the suspects inside.
Former British PM John Major, who was in Moscow to pay his respects, called for a full, transparent investigation into Boris Nemtsov’s murder, saying his voice would not be silenced.
It was, he added, his “saddest ever visit to Moscow”.
Latvian MEP Sandra Kalniete was refused entry into Russia at Sheremetyevo airport in Moscow without a proper explanation.
Sandra Kalniete said she had been made to wait two hours at the airport before being denied entry.
Bogdan Borusewicz, the Polish senate speaker who was to have led a delegation from his country, was denied a visa.
Russia said Bogdan Borusewicz was on a list of Polish officials barred from travelling to Russia, drawn up after the EU imposed sanctions on Russia over its involvement in Ukraine.
President Vladimir Putin will not attend the funeral, the Kremlin said, but will send a representative in his place.
Alexei Navalny is currently in custody for 15 days for handing out leaflets publicizing a demonstration.
He appealed against a court decision not to release him temporarily but the appeal is only going to be heard on Wednesday, the day after the funeral.
Tens of thousands of people marched through central Moscow on March 1 to honor Boris Nemtsov, with the opposition claiming some 50,000 people had attended the event.
Boris Nemtsov, 55, had been due to lead an opposition march that day, but his killing turned the event into a mourning rally.
His allies have accused the Kremlin of involvement but President Vladimir Putin condemned the murder as “vile” and “provocative”, vowing to find the killers.
Boris Nemtsov had been walking home from a restaurant with his Ukrainian girlfriend, Anna Durytska, when he was shot four times.
Anna Durytska, a 23-year-old Ukrainian model, was allowed to return to Ukraine after being questioned by Russian police.
She told Russian media she had not seen the killer, who struck from behind.
Russia’s Federal Protective Service, in charge of presidential security, has said its surveillance cameras did not record the shooting because they were pointed towards the Kremlin.
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