POLAND is building Europe's mightiest military in a direct challenge to Vladimir Putin as the country readies itself to fight.

Prime Minister Donald Tusk today vowed to modernise the country's already $35 billion-strong military after Russia's "deliberate" drone invasion earlier this week.

In an address to troops at an air base in the central city of Lask, he said Poland is due to receive its first F-35 fighter jets from the US next year.

It will be the first delivery of the 32 aircrafts expected by 2030 as the country continues to beef up its defence in the face of Russian threats.

Tusk said: "We will do everything to ensure that our allied obligations, which are so important from our point of view today, are fulfilled by our allies."

It comes as Nato vowed to defend "every

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