Today Ukrainian troops fell back to defensive lines amid one of Russia's largest

offensive since the beginning of the full-scale invasion more than two years ago.

President Vladimir Zolinsky has postponed all foreign travel and the U.S. Secretary of State

announced new weapons deliveries while in Ukraine.

But as Nick Schifren reports, in Northeast Ukraine's Kharkiv, the front is fragile.

Along the Ukraine Russia border, Ukrainian troops try to hold the line.

This is the Kharkiv region where Ukraine long ago push Russia out.

Now it needs reinforcements to hold Russia back.

Vovchansk is just two and a half miles from Russia and the center has been ripped apart.

A Ukrainian soldier fighting in the city sent his videos of Russian shelling and Russian troops

on the city's edge.

He says with the help of drone attacks on Russian tanks today

they push Russian troops back but he still fears Russia could take the city.

The situation of Vochchansk is very dire.

For the sixth day in a row, the enemy has been bombarding the city with all possible weapons and munitions,

rockets, artillery and bombs.

Tamaz Gomberishville is the regional administrator in Vovchansk.

He says the defensive lines built in other areas, including trenches,

and anti-tank dragon's teeth aren't as robust near Vovchansk.

After the deoccupation in September of 2022,

military and engineers built defensive lines.

But because we are so close to the Russian border, because of the constant fighting and

...