The whole world faces a threat if Russia succeeds in its invasion of Ukraine, according to Wladimir Klitschko.

Ukraine is just the beginning. If we fail, the rest of the world will go further.

Wladimir and his brother Vitali made the comments on Sunday.

Russian troops left the capital city of Ukraine last week after six weeks of fighting. Russia may try to seize this city again, according to Wladimir Klitschko.

Humanitarian support, political support and weapon support are what we appreciate. It is very important for us to know who our real friends are in this critical time.

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The boxer called for more military aid and economic sanctions against Russia.

We need weapons first and foremost. He said that we can't defend our country with our fists. Russia has an economic isolation. Russia is using for weapons to kill us, Ukrainians, every cent of the trade that you do with them.

The Biden administration and European leaders have promised to supply Ukraine with the weapons needed to fend off attacks from Russian troops.

At least 50 people were killed when two rockets hit a train station in eastern Ukraine. The station was full of people who fled their homes.

We don't need any other army or army boots on our soil. We will defend our homes and take care of it ourselves. We need those weapons to do that, Wladimir Klitschko said.

Vitali said that they defend the same values and principles with democratic countries. Support of Ukraine is important to us. The key for peace in Europe is unity around Ukraine.