Russia's Foreign Ministry said Thursday that giving Ukraine air defense systems, as requested by Ukraine's president in the United States Congress a day earlier, would be a destabilizing factor that would not bring peace to the country.

Ukrainian President Volodymyr Zelenskyy urged American lawmakers on Wednesday to do more to protect his country from Russia's invasion, pushing for the imposition of a no-fly zone and asking for aircraft and defensive systems.

"Such deliveries ... would be a destabilizing factor which will definitely not bring peace to Ukraine," Foreign Ministry spokesperson Maria Zakharova told a news briefing.

"In the long term, they could have much more dangerous consequences," she added.

The U.S. and its allies want to avoid NATO being drawn into the Ukraine conflict, but they have supplied Kyiv with military aid since Russia invaded Ukraine on Feb. 24.

Moscow calls its offensive in Ukraine a "special operation" to destroy its southern neighbor's military capabilities and capture what it regards as dangerous nationalists.

Slovakia's Prime Minister Eduard Heger on Sunday said NATO could discuss sending his country's Soviet-made S-300 air defense system to Ukraine.