The interview, which is in Russian, can be seen on the RG website here.

For those who don't know the name Nikolai Patrushev, Patrushev is one of the Russia's most powerful security / intelligence officers and a close ally of Putin. After serving between 1999 and 2008 as Director of the Russian Federal Security Service (FSB) (the successor organization to the KGB), Patrushev moved to being Secretary of the Russian Security Council since 2008. In fact, Patrushev took over as Director of the FSB in 1999 from the previous incumbent, Vladimir Putin.

The Security Council of the Russian Federation is chaired by Putin, with Patrushev as Secretary, overseeing the Security Council and answering directly to Putin. The deputy chairman of the Security Council is Medvedev Dmitry, the former Russian president and prime minister. Among the other member of the Security Council are current Russian prime minister Mikhail Mishustin, and Russian foreign minister Sergei Lavrov.

So when Nikolai Patrushev says that Russia is working on a plan to back the ruble with gold and commodities, it is not just anyone saying this, it is being said by the highest echelons of the Russian Government.

Media coverage (in English) of Patrushev's 26 April comments can be seen on the Russia Today (RT.com) website here. For those who cannot access RT.com due to it being locally blocked and who don't want to use a VPN, the RT.com article can be seen on 'thethreadtimes.com' website here.