Ukraine's President Volodymyr Zelensky speaks at the annual Yalta European Strategy meeting in this handout photo on Friday.

Ukrainian President Volodymyr Zelensky said NATO needed to mount a stronger response to last week’s incursion by Russian drones into Poland, or the Kremlin will believe it can push even further.

Nineteen Russian drones crossed into Polish airspace early Wednesday morning, several of which were shot down in the first-ever direct clash between NATO warplanes and Russian military hardware. In the aftermath, Poland invoked Article 4 of the NATO treaty, which calls for consultations whenever the territory of member state is threatened.

On Friday, NATO Secretary-General Mark Rutte announced the start of a new military operation , Eastern Sentry, that will see France

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