Lithuanian President Gitanas Nauseda says he was informed by his Polish counterpart Andrzej Duda of his country's intention to ask to invoke NATO's Article 4.
"Today, Poland will ask to invoke NATO's Article 4. Lithuania will undoubtedly support this position," the Lithuanian president told reporters after an inter-institutional meeting on Wednesday, held to discuss the regional security situation following the recent missile strikes in Ukraine and Poland.
Under this article, allied countries consult each other if a member country considers that its territorial integrity, political independence or security of any member is threatened.
Nauseda says Lithuania will also raise the issue of strengthening air defense throughout the region.
"Lithuania will actively participate in the discussion on the deployment of air defense systems primarily on Poland's border with Ukraine, but we are looking further, we are looking at NATO's entire eastern flank," the Lithuanian president said.
He reminded that one of the decisions made at the NATO Summit in Madrid over the summer was to develop air defense on the Alliance's eastern flank.
"I believe this incident we just experienced makes us urgently think about how to implement more swiftly this principle we stated in the declaration," the president said. "Declarations cannot defend us. Declarations can only protect in a way that their provisions are implemented."
Nauseda hopes that progress will be made in this area before the NATO summit in Vilnius next year.
"The situation and the latest developments confirm that, first, this was the right decision and, second, this decision needs to be implemented as soon as possible," the Lithuanian president said.
Earlier in the day, Lithuanian Foreign Minister Gabrielius Landsbergis told reporters that "we, of course, support it, we stand fully in solidarity with Poland".
Poland increased its military readiness after a missile landed in Poland near its border with Ukraine on Tuesday.
Duda said it was most likely a Russian-made missile strike. The Polish leader informed Nauseda that the investigation into the incident is still ongoing, the presidential press service said.