Lance Armstrong arrives at the Tour de France and wades into doping debate

Lance Armstrong touches down in France on Wednesday to ride with his friend Geoff Thomas, but before he left the United States he dipped his toe into the water of the doping accusations surrounding Chris Froome.

Team Sky claim that their rider data was hacked to obtain stats of Froome's destructive ride up Mont Ventoux in the 2013, used then to infer the Brit must be doping.

But after a similar show of force on the Col de Soudet on Tuesday questions were again raised as to whether the Sky rider is doping - and Armstrong took to Twitter to answer a few questions on the subject, as well as giving his thoughts on the Tour as a whole.

When one Twitter user requested that Armstrong stopped accusing others of doping (not that he did), the Texan replied rather contritely.

The Texan is set to ride a couple of stages of the Tour with Thomas, one day ahead of the pro peloton, to raise money for Cure Leukaemia.

While Armstrong was requested to stay away from the race by UCI president Brian Cookson, Thomas believes his presence will be a motivation to the other riders in the challenge.

 Watch highlights from stage 10 of the Tour de France