Russian opposition activists warn that they will expose the documents dug up by a murdered opposition leader that will show Russia's direct military interference in Ukraine.

Activits Ilya Yashin said before opposition leader Boris Nemtsov was killed on February 27, he was able to collect the accounts of parents, whose sons were Russian soldiers killed while fighting in Ukraine.

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Yashin further said the police have confiscated Nemtsov's computer, purportedly as part of the probe into his murder, but the evidence that will link Russia to the Ukraine crisis were not found by the cops.

This is because the documents that contain these testimonies have been safeguarded.

Russian President Vladimir Putin described Nemtsov's murder as a "disgrace" to Russia.

He urged the country's law enforcement agencies to concentrate on solving controversial crimes.

In a televised meeting with Interior Ministry officials, Putin stressed the need to solve more crimes.

"The most serious attention should be paid to high-profile crimes, including those that have political motives," Putin said.

He added, "Russia should finally be spared from the kind of shame and tragedy we have recently endured and seen."

Putin was referring to the murder of Nemtsov right in the capital of Russia.

Suspects in Nemtsov's killing have been identified.

Key oppositionleader Alexei Navalny believes Nemtsoc was killed either by the agents of the state security services or a 'pro-government organization" who are following the orders of the political leadership of the country, including Putin.

Navalny wrote on his blog that "the only question is how the order was formulated: 'You must kill Nemtsov,' or 'You must carry out a noisy, high-profile action.'

Nemtsov, who was a charismatic opposition leader, was laid to rest at Moscow's Troyekurovskoye Cemetery on Tuesday.

Prior to his burial, thousands of people lined up to see his remains at the Andrei Sakharov human rights center in the Russian Capital and to pay their last respects.

TagsRussia, Ukraine