NATO Secretary-General Jens Stoltenberg says the military alliance is stepping up its defenses against chemical and nuclear weapons as concern mounts that Russia might use such weapons in Ukraine.

Stoltenberg says that NATO leaders agreed at their summit Thursday to send equipment to Ukraine to help protect it against a chemical weapons attack.

“This could include detection equipment, protection and medical support, as well as training for decontamination and crisis management,” he told reporters after meeting in Brussels.

But Stoltenberg says the 30 NATO allies are boosting their own “preparedness and readiness.”

The leaders agreed Thursday to deploy four new battlegroups, which usually number from 1,000-1,500 troops, to Slovakia, Hungary, Romania and Bulgaria. Four other battlegroups are stationed in the Baltic States and Poland.

NATO nations are concerned that Russia’s attempt to falsely accuse them of working on chemical or biological weapons in Ukraine is part of a ruse by Moscow to create a pretext for using such arms itself.

In a video address to the NATO summit Thursday, Volodymyr Zelenskyy said Ukraine needs “military assistance without limitations,” as Russia is “using its entire arsenal” against the country.

Zelenskyy urged NATO to provide Ukraine with “1% of all your planes, 1% of all your tanks.” “We can’t just buy those,” Zelenskyy said. “When we will have all this, it will give us, just like you, 100% security.”

Ukraine is also in dire need of multiple launch rocket systems, anti-ship weapons and air defense systems, Zelenskyy said. “Is it possible to survive in such a war without this?,” he asked.

Zelenskyy said Russia used phosphorous bombs on Thursday morning, killing both adults and children. He reminded NATO leaders that thousands of Ukrainians have died in the past month, 10 million people have left their homes, and urged NATO to give “clear answers.”

“It feels like we’re in a gray area, between the West and Russia, defending our common values,” Zelenskyy said emotionally. “This is the scariest thing during a war — not to have clear answers to requests for help.”

Zelenskyy did not reiterate his request for a no-fly zone or ask to join NATO, according to a senior Biden administration official.

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