In early February, US Secretary of Defense Aston Carter said Washington would quadruple its funding to support the US posture in Europe, to reach $3.4 billion in 2017.
"I very much welcome the announcement of US plans to significantly increase presence in Europe with more troops, with positioning of heavy equipment with more exercise, with investment in critical infrastructure," Stoltenberg said in Munich, where a high-level international security conference is taking place.
The United States and NATO have been building up their combined military presence in Europe, particularly in Eastern European countries bordering Russia, using Russia's alleged interference in Ukraine as a pretext for the move.
Moscow has repeatedly stressed that it is not a party to the Ukrainian conflict, and that military expansion toward Russia's borders increases tensions by threatening regional and international security.