NATO is suspending all practical civilian and military co-operation with Russia.
Secretary General Anders Fogh Rasmussen said Russia's annexation of Ukraine's Crimea region was the gravest threat to European security for a generation, therefore there could be no business with Moscow.
According to the BBC, foreign ministers from the 28-member NATO bloc gathered in Brussels for their first meeting since Russia's annexation of Crimea.
They issued a strongly worded statement in which they condemned Russia's 'illegal' annexation of Ukraine's Crimea region.
They are also looking at options, including situating permanent military bases in the Baltic states, to reassure members in Eastern Europe.
Rasmussen also said Nato would offer Ukraine greater access to alliance exercises and support the development of its military, the report added.