MOSCOW (NYTIMES) - Families whose sons were listed as missing after the Russian flagship in the Black Sea sank a week ago are demanding answers in increasing numbers as the Ministry of Defence and top government officials stay silent about the fate of the crew.

At least 10 families have come forward publicly - on social media or to news organisations - to voice their frustration that they have been told by different officers or others that their sons were either alive, missing or dead. Yet, there still has been no official update to the initial announcement that the more than 500 crew members on the cruiser, the Moskva, were all rescued.

"They don't want to talk to us," Maksim Savin, 32, said in an interview about his search for his youngest brother, Leonid, 20, a conscript who served on the Moskva. "We are grieving. They drafted our little brother and most likely will never give him back."

The official silence on the fate of the Moskva's crew is part of a larger campaign by the Kremlin to suppress bad news about the war and control the narrative that Russians receive on its progress.

Many of the missing crew were conscripts, which has been a sensitive subject in Russia since the war in Chechnya, when young soldiers with little training were often thrown into battles and died in droves, souring public support for the war.

The cause of the sinking was disputed, with Russia claiming that an ammunition magazine exploded in a fire and then the damaged ship sank while under tow in rough seas. Ukraine said it hit the vessel with two Neptune missiles, an assertion that US officials corroborated. Whatever the case, the loss of one of the biggest warships since World War II has been an embarrassment for Russia.

Independent Russian news outlets based outside the country have reported that about 40 men died and another 100 were injured when the warship was damaged and sank. Those reports quoted an unidentified official and the mother of one sailor who died. In addition, the wife of an older midshipman confirmed his death to Radio Liberty, a US government network based outside Russia.

Opposition to the first war in Chechnya in the mid-1990s was spurred by Russian families angry that their conscript sons were being used as cannon fodder. "A few hundred" soldiers are still not accounted for from that war, said Alexander Cherkasov, former chair of the Memorial Human Rights Center, a group based in Moscow that was disbanded this month because of a court order.

"No one cares about the soldiers," he said, and the restrictions put on nongovernmental organisations mean it is now virtually impossible for them to do the tracing work, he said.

Russian President Vladimir Putin has said repeatedly that conscripts serving a year in the military would not be deployed in Ukraine, a statement contradicted by battlefield casualties.

The Union of Committees of Soldiers' Mothers of Russia, which dates back to the Chechen wars, confirmed it is receiving requests to search for missing soldiers. The organisation declined to comment further, citing a law against sharing information about soldiers with foreign organisations.

Parents of crew members on the Moskva, named after Russia's capital, have expressed outrage at what they described as an official runaround.

"We, the parents, are interested only in the fate of our children: Why did they - being conscripted soldiers - end up in this military operation?" said Dmitry Shkrebets, whose son Yegor, 19, worked as a cook on the Moskva.

In an interview, Shkrebets was reluctant to talk further, but on Sunday, he posted far harsher statements on VKontakte, the Russian equivalent of Facebook.

Initially, officers told him that Yegor was among the missing, but then they stopped responding, he said.

"Guys, went missing on the high seas?!!!" he wrote. "I asked directly why you, the officers, are alive, and my son, a conscript soldier, died?"

Shkrebets has since started collecting testimony from other families who cannot locate their sons. "The more we write, the harder it will be for them to remain silent about what is happening," he wrote. By Thursday night, he had collected the names of 15 soldiers whose families said they were missing, including 14 conscripts and one contract soldier, he wrote.

Dmitry Peskov, the Kremlin's spokesperson, said on Tuesday he was not authorised to release any information about missing sailors, and he referred questions to the Defence Ministry.

The ministry did not respond to requests for comment.

Numerous reports of missing conscripts first emerged on social media. One woman wrote that her brother had been at work in the engine room and was listed as missing, but she was certain that he was dead.

Anna Syromaysova, the mother of a missing conscript, told the independent Russian news agency Meduza that she had been unable to see any official documents related to casualties. "There are no lists," she said. "We're looking for them ourselves. They don't tell us anything." Reached by telephone, she declined to speak with a foreign news organisation.

After the war started on Feb 24, the Savin family contacted naval officers to inquire about the ship and were told that it was not taking part in military actions and was due back in port soon, Maksim Savin said.

Calls from Leonid had stopped, but after speaking with the officers, they got a letter from him saying that he anticipated coming home soon, Savin said.

He said that his younger brother, who trained as an auto mechanic in a vocational school, had been reluctant to go into the military and had not supported the war. A family picture shows a lanky young man in a sailor's uniform with a rifle slung across his chest, surrounded by his parents and three brothers.

Leonid Savin was much more comfortable hiking in the Crimean hills with the family dog, reading a book or tending to his plants, according to his brother. He had planted a palm tree and an avocado tree before heading off on his military service.

"In his letter home, he asked how his plants were doing," Savin said. "He was worried about them."