* Russia will respond quickly to any provocation * All of NATO is fighting against Russia, Putin says * Putin asks: is NATO is a paper tiger? * Putin dismisses claims that Russia will attack NATO (Recasts headline and paragraph 1, adds background paragraphs 9, 10 and 14) By Vladimir Soldatkin SOCHI, Russia, Oct 2 (Reuters) – President Vladimir Putin swiped back on Thursday at U.S. President Donald Trump for calling Russia a "paper tiger", suggesting NATO might be one and warning Europe that Moscow would respond swiftly if it thinks it is being provoked. Russia's war in Ukraine, Europe's deadliest since World War Two, has sparked the biggest confrontation between Russia and the West since the Cuban Missile Crisis in 1962, and Russian officials say they are now in a "hot" conflict with the W

See Full Page