The Pentagon said they were created to protect United States backed rebel fighters in Syria on Saturday against forces loyal to dictator Bashar al-Assad - which are in turn supported by Russian president Vladimir Putin.
The reports follow one from Reuters on Monday, where former associates of two of the Russians killed identified them to the news wire.
Russian news media reported that they had confirmed the deaths of several other military contractors, as well. It also quoted Alexander Averin, the leader of extreme leftist group Another Russia, saying that one of its activists, Kirill Ananyev, was killed by the US strike near Khusham, where the USA said its counterattack occurred.
Russia's denied any official involvement.
"Now we hear completely different explanations from our USA partners regarding their presence in Syria - they say that this presence should be maintained not only until military tasks are accomplished, but also until there is a stable political process that should end in a transition of power which will be acceptable for all - meaning for the United States - which is regime change".
The U.S. counterattack involved the use of F-15 fighter jets, B-52 bombers, AC-130 gunships and Apache combat helicopters as well as MQ-9 Reaper drones.
Putin has emphasized that no uniformed Russian soldiers were killed in the strike.
Bloomberg, however, reported that three Russian sources told them the attack was conducted by Russian mercenaries, and that as many as 200 Russian "contract soldiers" died in the attack.
The Syrian government has rejected United Nations-led efforts to form a committee to rewrite Syria's constitution, a central demand of the Syrian Congress of National Dialogue held in Sochi, Russia last month.
Kremlin spokesman Dmitry Peskov declined to comment on the incident, in which the death toll of private Russian soldiers may have been five times greater than the Russian Defense Ministry's official count of servicemen who have died in Syria.
U.S. strikes have reportedly killed at least 600 Russian mercenaries recently, according to reports.
"This is a big scandal and a reason for an acute worldwide crisis", said Vladimir Frolov, a former Russian diplomat and lawmaker who's now an independent political analyst.
Mr Yavlinsky said fierce mercenary forces "are trained at Russian army facilities" and "receive military awards in the Kremlin" in secret. "I advise you to contact the defence ministry". Some Russian lawmakers have called for legislation that would set rules fro private military contractors.
There's a refinery in Deir Ezzor that once funded Islamic State operations that's now "crucial" to Assad's plans to finance the reconstruction of Syria once a peace deal is finally reached, according to Yury Barmin, a Middle East analyst at the Russian International Affairs Council in Moscow.
Averin said he believed that casualties among the Russians present amounted to more than "the typical Wagner loss of just a couple of people".
Andrea Nahles also said she would fight for the ruling coalition with the conservatives of Angela Merkel . Schulz said last week he would quit to allow the party to regroup and he recommended Nahles as leader.
Burnley have not won since December 12, a run of 10 games, but Carvalhal insisted: "It is not a good period to play against them". The Premier League match between Swansea and Burnley will not be broadcast on live TV.
Arizona is a "safe haven" state, therefore a person may surrender a child to authorities without being punished. He was taken to a local hospital and is now in the care of Arizona Department of Child Safety.
The director was Roland Van Hauwermeiren, who The Times alleges used prostitutes at a villa rented for him by Oxfam. Although the charity has denied covering up the alleged scandal, Christian Aid said the claims are "deplorable".
Coalition and Russian officials were "in regular communication ...before, during and after" the assault, the same official said. It also said it was aware only of 25 Syrian militia members having been wounded in the United States strikes.
It happened during a historic meeting between North and South Korean officials at Seoul's presidential palace. What's certain is that these Games, more so than any in recent memory, are about far more than sports .
And if they don't think it's important yet, maybe they would heed the word of the Director of National Intelligence Dan Coats . Democratic Senator Jack Reed asked the officials whether Mr Trump had ordered them to take action.
Paul apologized for the "mistake", and also stepped away from the platform for some time to reportedly do some soul searching. Following vast backlash , Paul publicly apologized and pledged to donate $1 million to suicide prevention organizations.
He also advised Rahul to learn "lessons on national security" from former Defence Minister Pranab Mukherjee. On Friday, BJP chief Amit Shah targeted the Congress for its attack on the government over the Rafale deal.
The performance also surpassed the 300-drone salute that was pre-recorded with Lady Gaga for Super Bowl LI a year ago . The broke the Guinness World Record for number of drones flown at the same time, the spokeswoman said.
Distillate production averaged over 5.1 million barrels a day last week, up about 500,000 compared to the prior week's production. Whether this is a blip or the beginning of a longer term decline in crude prices is still an open question.
Apple , however, calmed the concerns saying the code is tied to old software and would not affect the devices. Strafach echoed Apple's sentiment that the security of iOS devices doesn't depend on obscurity.
Xiaomi Redmi Note 5 launched
In the typical Xiaomi fashion, the company did not disappoint anyone when it announced the pricing of Mi TV 4 (55). The Mi TV 4 is bundled with 11-button Mi Remote that works with the TV and Set Top Box, using the Mi IR cable.
2 police officers shot and killed in Westerville, Ohio
And they did it great. "This was their calling and they did it right", said Morbitzer, his voice halting and thick with emotion. Police in OH said two officers were fatally shot at a home in a Columbus suburb on Saturday, and a suspect was in custody.
'There is nothing impossible in the Premier League'
Boss Wenger blasted: "There was more at stake than the derby and that is why it is so disappointing to lose the way we lost it". Arsenal go into Saturday's game four points behind fifth-placed Spurs and five behind fourth-placed Chelsea .
Uber's Waymo deal recasts existential question
Alphabet's case hinges on the fact that Uber hired Mr Levandowski, who had worked in the firm's self-driving vehicle division. Khosrowshahi gets to take credit for eliminating another big hurdle as he moves the company toward its promised 2019 IPO .