Russian President Vladimir Putin was reportedly not impressed by US President Joe Biden’s ideas on security guarantees demanded by Moscow after the two leaders spoke on the telephone on Saturday.

As per a Reuters report, Putin agreed to review the ideas proposed by the US, but felt that Moscow’s key concerns about security guarantees were not addressed by the Biden administration.

In a press briefing after the high-stakes phone call between the two heads of state on Saturday, Kremlin aide Yuri Ushakov told reporters that the nature of the call had been “business-like” despite escalating tensions in Ukraine.

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Ushakov was also quick to add that the West was responsible for the “hysteria” surrounding Ukraine, saying that Russia had no plans of invading its neighbour.

“Biden predictably mentioned possible tough anti-Russian sanctions in the context of the tense situation around Ukraine, but that was not the focus of his rather lengthy conversation with the Russian leader,” the Kremlin aide told reporters.

Ushakov went on to say that Biden had laid out a series of ideas to address Moscow’s security concerns, including a measure to prevent Ukraine from ever joining NATO.

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“I will immediately note that the Russian president reacted in the spirit that the Russian side would carefully analyse the considerations expressed by Biden and would undoubtedly take them into account,” the Kremlin aide said about Russia’s next steps.

“But unfortunately, and this was said, these considerations do not touch upon the central, key elements of Russian initiatives,” Ushakov added, hinting at Putin’s disappointment with the proposed solutions.

The official further said that the proposed solutions laid out by Biden were similar to the ideas put forward by the US and NATO in response to Russia’s security demands that were handed over to the US on January 26.

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Ushakov finally said that Russia were in the process of preparing a response to the US and NATO’s proposals about the security situation and that Moscow would be released its response soon.

The high-stakes call between Putin and his American counterpart took place on Saturday amid growing concerns about an imminent Russian invasion of Ukraine.

After the call, the White House issued a statement saying that Biden had warned his Russian counterpart of dire consequences in the event of a Russian invasion of Ukraine.

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“President Biden spoke with President Vladimir Putin today to make clear that if Russia further invades Ukraine, the U.S. and our allies will impose swift and severe costs on Russia. President Biden urged President Putin to engage in de-escalation and diplomacy instead,” read the White House’s statement.

Russia has reportedly amassed more than 100,000 troops along the Ukrainian border and US officials fear that an invasion may take place any time.

Russia, however, has categorically denied allegations about its plans to invade Ukraine, attributing the hysteria to Western misinformation, and has repeatedly stressed that its only intention is to secure security guarantees from the US and its NATO allies.