STORY: Lavrov, in a wide-ranging interview broadcast on state television, also said that the core of any agreement to end the conflict in Ukraine would depend largely on the military situation on the ground.
Lavrov had been asked about the importance of avoiding World War Three and whether the current situation was comparable to the Cuban missile crisis in 1962, a low point in U.S-Soviet relations.
Russia, Lavrov said, was doing a lot to uphold the principle of striving to prevent nuclear war at all costs.
"This is our key position on which we base everything. The risks now are considerable," Lavrov said. "I would not want to elevate those risks artificially. Many would like that. The danger is serious, real. And we must not underestimate it."
Russia had lost its "last hope to scare the world off supporting Ukraine," Ukraine's Foreign Minister Dmytro Kuleba tweeted after Lavrov's interview. "This only means Moscow senses defeat."
British Armed Services Minister James Heappey called Lavrov's remarks an example of "bravado" that had become the Russia's foreign minister's "trademark."