Last week, media reported that the US was planning to deploy nuclear weapons in the UK.
"We have heard of these reports, of course. We are studying the source of these reports and their credibility," Lavrov said at a joint press-conference after a meeting with Gambian Foreign Minister Mamadou Tangara.
Russia is aware of the nuclear arsenal of NATO countries, Lavrov said.
"Since NATO declared us the main threat, in fact the enemy, we have regarded all nuclear weapons of NATO member states — the United States, UK and France — as a single nuclear arsenal aimed against Russia... We regard all nuclear weapons of this NATO troika as a single nuclear arsenal and, accordingly, we are building our plans to reliably ensure the security of the Russian Federation," Lavrov said.