"Sweden will summon Russia's Stockholm ambassador to complain about an "attempt at interference" with the Swedish NATO application process," said Sweden's foreign ministry, APA reports citing Reuters.
Sweden and Finland in 2022 both sought NATO membership and are hoping to complete the process this year.
The Russian ambassador in a statement on the embassy's web site said joining NATO made the Nordic countries "a legitimate target for Russian retaliatory measures, including those of a military nature".
A Swedish foreign ministry spokesperson said that the ambassador would be summoned.
"The foreign ministry is summoning the Russian ambassador to protest this obvious attempt at interference," Swedish Foreign Minister Tobias Billstrom separately told news agency TT.