Polish president says apparent missile strike in Poland was ‘isolated incident,’ but notes the ‘North Atlantic Alliance is on standby’

Polish security forces investigate in Przewodow village near the Ukrainian border, where two Poles were killed by a suspected missile strike.

The president of Poland doesn't yet know who fired the missile that killed two people.

The explosion, which took place about 15 miles from the Ukrainian border, came as Russia launched missiles at Ukrainian cities and energy facilities.

The projectile was referred to as either a missile or a rocket by the president.

The incident was an isolated one. There isn't any indication that more will happen.

Poland is a member of a military alliance. The development set off a chain of diplomatic activity among members of the alliance andUkraine, which is not a NATO member but which gets massive military aid from the alliance.

The White House said that Biden offered full U.S. support for the investigation. The US has an ironclad commitment to NATO.

NATO Secretary General Jens Stoltenberg was one of the people Warsaw communicated with.

The alliance is on stand-by. The air defense of the Polish army has been strengthened. Allied planes will support our planes. We act cautiously.

Moscow didn't say anything. CNBC requested comment from Russia's Ministry of Defense.

It was a rocket launched from the territory of the Russian Federation, according to the president of Poland.

The ambassador of the Russian Federation was summoned by the Minister of Foreign Affairs.

The U.S. markets finished higher on Tuesday.

The Group of 20 summit is taking place in Indonesia with Biden, Macron, and others. Zelenskyy gave a video speech to world leaders at the meeting where he outlined 10 demands that need to be met before hostilities can cease in Ukraine.

Biden told reporters that the situation in Poland remained unclear after an emergency meeting of national leaders.

World leaders hold an emergency meeting in Bali to discuss the explosion on Polish territory. Shown are U.S. President Joe Biden (C), U.K. Prime Minister Rishi Sunak, Canada’s Prime Minister Justin Trudeau, German Chancellor Olaf Scholz, French President Emmanuel Macron, Italian Prime Minister Giorgia Meloni, Japan Prime Minister Kishida Fumio, European Commission President Ursula von der Leyen, European Council President Charles Michel, Spain’s Prime Minister Pedro Sanchez, Netherlands’ Prime Minister Mark Rutte and U.S. Secretary of State Antony Blinken

According to a draft version of the document seen by CNBC, the G-20 nations are expected to condemn Russia.

When Russian troops suffer setbacks on the battlefield, the Kremlin ramps up missile attacks on civilians. Russian invaders were forced to flee Kherson by the Ukrainian army last week.

It is unlikely that Russia or NATO will use the strikes in Poland as a pretext for widening the war, according to Mick Ryan.

NATO is likely to strengthen its air defense along the borders with Russia, including Poland and the Baltic states, according to him.

The attacks in Poland and Ukraine will make the resolve of President Zelensky and the Ukrainian people even stronger.

It is not yet clear how the missile ended up exploding on Polish territory.

Ryan said that it would not have fallen here if Russia hadn't invaded Ukranian.

The report was contributed to by NBC News and CNBC.