Explosions reported in Russian-occupied Svatove, Luhansk Oblast.

It is the third time Russian forces have used pipelines as a tactic, which they first adopted during the Battle of Avdiivka. Back in March, around 100 troops passed through a gas pipeline to reach Ukrainian positions in Sudzha, in Russia’s Kursk Oblast.

"Eastern Sentry is not just a new initiative – it is a clear signal: NATO’s borders are inviolable, and the security of our citizens remains a priority," Poland's General Staff wrote on X.

Ukrainian air defense downed 137 drones in the north, south, east, and center of Ukraine, according to the Air Force.

The top European diplomat described Russia’s three-step negotiation tactic: demanding what it never had, followed by ultimatums and threats, finished off by the West ready to concede to Moscow’s demands.

The number includes 950 casualties that Russian forces suffered over the past day.

A 7.4 magnitude earthquake struck near the Russian peninsula of Kamchatka overnight on Sept. 13, the U.S. Geological Survey (USGS) reported.

"If something happens — a drone, a provocation, or suspicious troop movements — we can do it," Lithuanian Interior Minister Vladislav Kondratovic said.

The latest reported death toll includes 36,568 volunteers, 18,261 recruited prisoners, 14,797 mobilized troops, and 2,777 mercenaries.

"As of today, we can state that the Russian offensive operation on Sumy has been completely thwarted by our forces," President Volodymyr Zelensky said on Sept. 12, citing front-line reports from Commander-in-chief Oleksandr Syrskyi.

"The United States stands by our NATO allies in the face of these alarming airspace violations," said acting U.S. Ambassador to the U.N. Dorothy Shea, addressing the 15-member Security Council.

The sanctions list includes Russian President Vladimir Putin, Foreign Minister Sergey Lavrov, top military officials, lawmakers, oligarchs, propagandists, mercenaries, and individuals responsible for the abduction of Ukrainian children from occupied territories.

Polish Foreign Minister Radoslaw Sikorski said Poland sees no reason to sever diplomatic ties with Russia, noting that it has already limited the activities of Russian diplomats in several regions.

"Every time you are here, General, we can sleep a little more. We would like you to travel to all Ukrainian cities," Zelensky said at the annual Yalta European Strategy meeting.

The Russian attack on Poland exposed serious holes in NATO's air defenses.