After Americans and Europeans accelerated the delivery of weapons to Ukrainian forces, Russian President Vladimir Putin challenged Western countries to try to defeat Moscow "on the battlefield"

"Today, we hear that they want to defeat us on the battlefield. What do we say? Let them try ".

Putin warned: "Russia has not yet begun serious matters in Ukraine."

The Russian President added: "We still do not reject peaceful negotiations. But those who refuse to negotiate must know, the longer it takes, the harder it will be to reach an agreement with us "

The Russian military is advancing in Ukraine's eastern regions and has so far succeeded in controlling 20 percent of the country, according to Ukrainian President Wlodomir Zelensky.

After Russia extended its control over the Lugansk region, its forces began crawling towards the rest of the cities in Lugansk's Donbas region, and the military effort is currently based on three specific cities.

Moscow and its pro-separatist forces control most of the territory of the Donetsk region and seek to complete control of the rest of the territory in the Donbass, where the separatists announced the establishment of "two republics" in 2014.