RIO DE JANEIRO -- The split between Olympic leaders and global anti-doping officials over the Russian doping scandal continues to escalate.The World Anti-Doping Agency fired back on Monday, a day after International Olympic Committee president Thomas Bach suggested the agency was to blame for the last-minute chaos over the participation of Russian athletes in the Rio de Janeiro Games.Bach said the agency should have acted sooner on evidence of state-sponsored doping rather than release the damning report by Canadian investigator Richard McLaren so close to the Games, which open on Friday.While it is destabilizing in the lead-up to the games, it is obvious, given the seriousness of the revelations that [McLaren] uncovered, that they had to be published and acted upon without delay, WADA president Craig Reedie, who is also an IOC vice president, said in a statement Monday.On Sunday, Bach defended the IOCs decision not to ban the entire Russian delegation from the Olympics, and said the IOC was not responsible for the timing of the latest WADA report, which came out on July 18.On July 24, the IOC placed the burden on international sports federations to determine if Russian athletes should be allowed to compete in Rio. More than 100 Russian athletes -- including the track and field team -- have been excluded, with more than 250 declared eligible by the federations so far.The IOC is not responsible for the timing of the McLaren report, Bach said. The IOC is not responsible for the fact that different information which was offered to WADA already a couple of years ago was not followed up. The IOC is not responsible for the accreditation or supervision of anti-doping laboratories.WADA -- which was created by the IOC in 1999 to lead the anti-doping fight, and receives half of its funding from the IOC -- issued a long statement defending its handling of the allegations against Russia.WADA understands that the timing of the McLaren Investigation Report has been destabilizing for a number of organizations as they prepare for the Rio Olympic and Paralympic Games, the statement said. However, WADA wishes to factually clarify that the agency acted immediately on allegations concerning Russia when it had corroborated evidence and the power to do so under the World Anti-Doping Code.WADA said it set up a commission headed by Dick Pound to investigate allegations of systematic doping made in a documentary by German broadcaster ARD in December 2014. The agency said it acquired new powers to investigate in January 2015.Pounds report, which was released in November 2015, detailed widespread cheating in track and field and led the IAAF to ban Russias entire team. Pound said he also found that doping in Russia was likely not restricted to track and field, and that Russian secret service officers were present in the Sochi and Moscow laboratories. But Pound said he did not uncover concrete evidence that the Russian government was manipulating doping controls.WADA said it acquired strong evidence of Russian state involvement in early May, when CBS 60 Minutes and The New York Times published allegations by Moscows former lab director, Grigory Rodchenkov. That led to McLarens investigation, which corroborated Rodchenkovs claims that dirty samples of Russian athletes were replaced with clean ones during the 2014 Winter Games in Sochi.Since then, WADA director general Olivier Niggli said, the agency facilitated the transfer of relevant information that is available to date about individual Russian athletes to the various international federations.It should be noted however that Professor McLarens focus thus far was on establishing involvement of the Russian State and not regarding individual athletes that may have benefited, Niggli said. WADA will continue supporting anti-doping organizations by providing information as and when it becomes available via McLarens ongoing Investigation.Responding to Bachs swipe about supervision of the Russian doping labs, WADA said its focus is on the technical abilities of the labs. It noted that it suspended the Moscow lab in 2015 after violations were cited in Pounds report.Addressing corruption within the anti-doping system -- including state or secret service interference in laboratory operations -- will be one of the topics discussed during a WADA conference in September, the agency said.Darlington Nagbe Jersey . -- Bryant McKinnie came out of his stance and lowered his shoulder into a practice squad player, causing a crisp thud to reverberate in the Miami Dolphins practice bubble. Matt Besler USA Jersey . -- The boos poured down on Tom Brady and the New England Patriots at the end of a horrible first half. http://www.usasoccerauthority.com/clint-dempsey-usa-jersey/ . 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Matt Miazga USA Jersey . -- Playing time has been limited for Maxim Tissot this season, so the Montreal Impact defender made the most of his first scoring opportunity on Saturday.Charlie Nicholas says Arsenals strikers are not solely to blame for the clubs disappointing campaign, suggesting a central defender should be Arsene Wengers priority this summer.The Gunners slender title hopes were ended with a goalless draw at Sunderland on Super Sunday and a top-four finish is far from guaranteed with fifth-placed Manchester United five points behind with a game in hand.Wengers side are the lowest scorers in the top four and have found the net the same amount of times at home as second-from-bottom Newcastle, while they also have the joint-worst defensive record in the top four along with Manchester City. Former Arsenal forward Nicholas told Sky Sports: I accept over the last two months that the central striker area has been a massive problem, but theres been a problem from day one and thats at centre-back.Theres the soft excuse that Alexis Sanchez, Olivier Giroud, Danny Welbeck and Theo Walcott have all had their injury problems, but for me the biggest issue exists at the back. Arsene Wenger admitted he is worried about missing out finishing in the top four Theres been so many games where theyve been in control then boom, theres a weak defensive decision and then all of the sudden theyre over the place and the panic sets in.Its just not been solid at all and in my opinion Arsenal have not had a proper defence in five or six seasons.While Wenger has come under fire for failing to add anoother striker last summer, Nicholas thinks Real Madrids 22-year-old defender Raphael Varane could be the ideal candidate to strengthen the backline.dddddddddddd In my opinion Arsenal have not had a proper defence in five or six seasons. Charlie Nicholas When Arsene Wenger starts planning for next season, if he is there, which I think he will be, I would rather he addressed the defensive issues than bought a striker, he added.If I had a position to buy right now and a choice between a centre-forward and Raphael Varane, my priority would be Varane. Charlie predicts... Find out what Charlie is tipping up for Man City v Real Madrid here. It needs to be a leader but one of significance on the pitch, not like Per Mertesacker saying the right things in front of the camera 30 minutes before the game. Leadership isnt chit chat, its being willing to sacrifice yourself. Arsenal create chances and I know its a problem not taking them but they tend to take enough to win games. What they dont do is win games 1-0 like Leicester have been doing. Per Mertesacker saw red in Arsenals 1-0 defeat to Chelsea in January The hardest position to fill is the centre-forward but youve got to sort the basics first and I dont think it needs to be a superstar striker because of the chances they create. Giroud has a decent scoring record for the club and hes not a superstar.If they get Gonzalo Higuain in for say £50m and keep conceding two or three goals then they still wont win anything.Also See:Parlour: Wenger likely to staySzczesny wants Roma stayArsenal need to be carefulWilshere sets sights on Euros ' ' '