"Britain and our allies have made it clear to Russia that its military build-up on the border with Ukraine ... is unacceptable," the press service said.
Truss condemned the allegedly destabilizing activities of Russia and declared support for the sovereignty and territorial integrity of Ukraine.
"The only way for Russia is de-escalation and participation in constructive negotiations," the British Foreign Minister concluded.
Earlier, she expressed the opinion that Russia should start a diplomatic dialogue with other countries to reduce tensions on the border with Ukraine.
In turn, the official representative of the Russian Foreign Ministry Maria Zakharova said that Great Britain is "shaking" the internal political situation in Russia.
As Russian Foreign Minister Sergei Lavrov noted, NATO member countries are systematically transforming Ukraine into a military foothold against Russia.