The Secretary of State promised fellow NATO member Lithuania that the U.S. will act to repel any Russian military aggression.
The United States commitment to NATO is sacrosanct.
The foreign minister of Lithuania, Gabrielius Landsbergis, was speaking at the press conference. He made similar comments in the Baltic country of Latvia.
In his State of the Union address last week, President Joe Biden said that NATO would be defended if it came under attack.
There is no decision yet on whether to put U.S. troops in the Baltics permanently.
NATO members and other Western countries have provided aid to Ukraine and punished Russia since it invaded the neighboring country.
Concerns have been raised that Russia will target the Baltic states, which were part of the Soviet Union before it broke up.
On Tuesday, Blinken is going to visit Estonia.
The United States, Lithuania, and other partners of the alliance are doing a lot.
The Chechen city destroyed the site of the massacre of more than 8,000 Muslims in 1995 in Bosnia and Herzegovina.