WATCH: Blinken assails misinformation after hinting U.S. may allow Ukraine to strike inside Russia

PRAGUE (AP) — U.S. Secretary of State Antony Blinken on Thursday assailed Russian attempts to sow discord in democracies with misinformation after hinting the Biden administration may soon allow Ukraine to use American-supplied munitions to strike inside Russia.

Watch Blinken’s remarks in the player above.

With an increasing number of officials saying Ukraine must be able to defend itself by attacking targets in Russian territory, Blinken joined NATO foreign ministers for a meeting in Prague, where he said Moscow’s use of misinformation and disinformation was a “poison” and signed an agreement with the Czech government to combat it.

He also toured a Czech military base, where he saw armored vehicles that Prague is sending to Kyiv to help fight Russia’s invasion and received a briefing on a Czech initiative to supply Ukraine with a million rounds of ammunition by the end of the year.

“We know that a major front in the competition that we have, the adversarial relationship that we have, notably with Russia, is on the information front,” Blinken said.

He said the agreement with the Czechs — the 17th such accord the U.S. has signed with partner nations — would help “to effectively deal with misinformation and disinformation, which is a poison being injected into our democracies by our adversaries.”

READ MORE: France’s Macron urges a green light for Ukraine to strike targets inside Russia with Western weapons

“The more we’re able to do together both between our countries but also with other countries, the more effective we’re going to be exposing it and dealing with it,” Blinken told reporters at a signing ceremony with Czech Foreign Minister Minister Jan Lipavsky.

Lipavsky agreed, noting that Czech authorities had recently exposed a major Russian-backed misinformation campaign.

“We are facing confrontation between democracies and autocracies,” Lipavsky said. “The Kremlin has started targeting targeting democracies all around the world with cyber warfare, propaganda and influence operations and this danger simply cannot be underestimated any more.”

At a separate NATO-related event on Thursday, Lipavsky said Ukraine needs resources to counter Russia’s relentless assault.

“Ukraine cannot fight against Russia with one hand tied behind its back,” he said. “Ukraine must be able to fight against Russia’s barbaric invasion even on Russian territory. Political resolve must be backed by credible capabilities.”

Norway’s foreign minister, Espen Barth Eide, told Norwegian broadcaster NRK that his country believes Ukraine “has a crystal-clear right under international law to attack Russia inside Russia as part of the defense of its territory.”

Russia’s invasion of Ukraine and support for Ukrainian attempts to repel it will be a major focus of the NATO foreign minister meetings on Thursday and Friday — the alliance’s last major diplomatic gathering before a leaders’ summit in Washington in July to mark the 75th anniversary of its founding.

On Wednesday in Moldova, Blinken said that U.S. policy on how Ukraine deploys American weapons is constantly evolving, suggesting that Washington may rescind an unwritten prohibition on Ukraine’s use of them for attacks on Russian territory.

Although U.S. officials insist there is no formal ban, they have long made clear that they believe the use of American weapons to attack targets inside Russia could provoke an escalatory response from Moscow, something that Russian President Vladimir Putin has promised.

That position appears to be being reconsidered, and Blinken noted that it was a “hallmark” of the Biden administration’s stance on Ukraine to “adapt and adjust” as needed. Blinken visited Kyiv earlier this month and heard a direct appeal from Ukrainian President Volodymyr Zelenskyy to use U.S. military assistance to strike positions in Russian from where attacks on Ukraine are launched.

“As the conditions have changed, as the battlefield has changed, as what Russia does has changed in terms of how it’s pursuing its aggression, escalation, we’ve adapted and adjusted too, and I’m confident we’ll continue to do that,” Blinken said at a news conference in Chisinau.

READ MORE: Pentagon vows to keep weapons moving to Ukraine as Kyiv faces a renewed assault from Russia

“At every step along the way, we’ve adapted and adjusted as necessary, and so that’s exactly what we’ll do going forward,” he said. “We’re always listening, we’re always learning, and we’re always making determinations about what’s necessary to make sure that Ukraine can effectively continue to defend itself, and we’ll continue to do that.”

Earlier this week, French President Emmanuel Macron and NATO chief Jens Stoltenberg said that Western countries should not object if Ukraine needs to strike inside Russia to defend itself. Stoltenberg reaffirmed that position on Thursday.

“I believe that time has come to (re)consider some of these restrictions to enable the Ukrainians to really defend themselves,” he said. “We need to remember what it is. This is a war of aggression launched by choice by Moscow against Ukraine.”

The right to self-defense, he said, ” includes also striking legitimate military targets outside Ukraine.”

Associated Press writer Karel Janicek contributed to this report.