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Lviv, Ukraine (CNN) Russia began missile attacks near an airport in Lviv on Friday, a major Ukrainian city not far from the Polish border that has until now mostly been spared from the continuous bombing observed throughout much of the nation during the conflict.

Lviv mayor Andriy Sadovyi claimed multiple missiles damaged an airplane maintenance factory, but that activity at the facility had ceased before the attacks and there were no reports of deaths.

Ukraine's armed forces say early intelligence shows Russia fired six missiles towards Lviv on Friday morning. It claims the missiles were most likely air-launched cruise missiles fired from airplanes over the Black Sea.

Two of the six were intercepted by air defense systems, the armed services' post on Facebook claimed.

The strike will add to worries that Russia's conflict may move farther west. Here's all you need to know about the significance of Lviv.

Location

At approximately 43 miles (70 kilometers) from Poland's border, Lviv is at NATO's doorstep — so if assaults are cranked up here, it might have worldwide ramifications.

Friday's incident comes after Russia unleashed a salvo of missiles at the Yavoriv military installation, situated between Lviv and the Polish border, on Sunday, killing at least 35 people.

Refugees

Lviv has become a safe haven for Ukrainians escaping other war-torn sections of the nation.

It supports more than 200,000 internally displaced persons in a population of little over 700,000, according to the mayor. They've surged into Lviv in search of relative safety, with many using it as a halting place before making their way across the border.

Logistics

The bigger territory serves also as a critical weapons supply route to the Ukrainian military and a wider resistance operation that has blocked Moscow's preparations for a blitz-like assault.

Western Ukraine's supply channels have grown even more critical as Russia chokes off sea access and lays siege to the country's south. To the north lies Belarus, which hosts Russian forces and has been one of the launching sites of the invasion.

Culture and history

Lviv's historic center is a UNESCO World Heritage Site and the National Museum has the country's most comprehensive collection of holy medieval art and rare religious texts.

According to the city's official website, Lviv was the venue of Ukraine's first major actions in favour of independence after communism crumbled.

On September 17, 1989 Lviv became the venue of the greatest protest in favour of resuscitation of Ukraine's independence, with 100,000 participants.

The Act on State Independence of Ukraine was approved on August 24, 1991 and hundreds of people filled the streets of Lviv in festivities the next day.

"Being an unquestionable capital of Ukrainian culture, spirituality and national identity, Lviv has always played a vital role in the development of democracy and battle for Ukraine's independence," the website claims.

Lviv was previously part of the Hapsburg empire — then known as Lemberg — but became the genuine heartland of Ukrainian national struggle during Soviet times, according to the country's official tourist site.

Details on UNESCO's site illustrate how Lviv, established in the late Middle Ages, became a thriving administrative, ecclesiastical and economic city for many centuries. Up to the invasion, the medieval urban layout, as well as the city's numerous excellent Baroque and later structures, were largely conserved, according to UNESCO.

UNESCO said earlier this month it was in continual touch with all relevant institutions throughout Ukraine, as well as with Ukrainian cultural specialists, to analyze the situation and to bolster the safeguarding of cultural objects.

At the commencement of the war Audrey Azoulay, UNESCO Director-General, said: "We must defend the cultural legacy in Ukraine as a testament of the past, but also as a catalyst for peace and cohesion for the future, which the international community has a responsibility to protect and maintain."

Temporary base

The city has also become the provisional home for several media companies and diplomats, who were forced to move from Ukraine's capital, Kyiv.