It said in a statement Trutnev, at a meeting with the president of the Confederation of British Industry, John Sunderland, named the three fields as the Titov and Trebs oil fields in the Timan Pechora oil province and the Chayadinskoye gas field in East Siberia.
He also said Eurasia's biggest gold deposit Sukhoi Log and the Udokan copper field would be also classified as strategic.
The idea of establishing a list of strategic fields emerged after President Putin called on the government earlier this year to tighten the state grip over strategic resources.
Investors have said they were concerned about the move as it could limit the growth potential in Russia of foreign players such as ExxonMobil or BP's 50-50 Russian venture, TNK-BP.
The Natural Resources Ministry this month came up with its first concrete proposals which it will submit to the State Duma for inclusion as amendments to the existing subsoil law in November and to the new law next year.
The ministry wants limits on foreign participation in auctions for natural resources that are scarce in Russia -- diamonds, uranium, quartz and others.
The second factor would be the field size.
Foreign firms would be banned from fields with more than 1 billion barrels of oil or 1 trillion cubic meters of gas, but large remote offshore fields could still be developed by foreign ventures.
The third factor would be location, namely reserves situated on, or close to, Russian military sites.
Troika Dialog brokerage said in a note the confirmation of the first five fields as strategic came as no surprise as they were meeting the ministry's size criteria.
"The final list of strategic fields promises to be much longer," said Troika's analyst Oleg Maximov.
But Aton brokerage said it did not expect the list of strategic fields to grow fast. "The shorter than expected list of resources classified as strategic is a foreign investor-friendly gesture by the government and means foreign companies will still have plenty of opportunities to participate in auctions for very sizeable fields," Aton said in a note.
"This, together with an expected reduction of the tax burden on oil companies is positive news for the Russian oil and gas sector and in turn likely to be a broader macroeconomic positive," it added.
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