The United States as well as other nations who have been monitoring the Ukraine situation are now made to wait on what Russian leader Vladimir Putin truly has under his sleeve.

Among those left clueless is US President Joe Biden who deployed troops to Ukraine to be on standby just in case Russia does push through with a speculated invasion of Ukraine.

Tensions are mounting and Biden knows that one order from the Russian leader could lead to an invasion. He is aware that one man’s opaque decision-making will determine what may happen next, CNN reported.

"This is all Putin. I don't even think his people know for certain what he will do," Biden stated. "I may be moving some of those troops in the near term just because it takes time. And again, it's not provocative," he added.

But from how things stand now, Biden and NATO are left at the edge of their seats to figure out what the real plan of Russia is when it deployed roughly 100,000 soldiers near the Ukraine border, BBC reported.

"Ordinarily, if it were a different leader, the fact that he continues to build forces along Ukraine's border, from Belarus all the way around, you'd say, 'Well, that means that he is looking like he is going to do something,'" Biden stated. "But then you look at what his past behavior is and what everyone is saying and his team as well as everyone else as to what is likely to happen, it all comes down to his decision."

Biden and other nations have been monitoring the situation after deploying 8,500 US troops to stand ready to deploy to Eastern Europe. However, he made it clear that no American forces would move into Ukraine.

Further US military assistance to Ukraine arrived Tuesday with approximately 300 Javelins and 79 tons of equipment arriving in the country, the US embassy in Kyiv said in a tweet.

Diplomats from Russia, Ukraine, Germany and France gathered in Paris on Wednesday for talks about the ongoing tensions.

US President Joe Biden speaks to the press about Russia and Ukraine US President Joe Biden speaks to the press about Russia and Ukraine Getty Images | SAUL LOEB / AFP