Russia and America's New START Treaty is set to come to an end very soon

Vladimir Putin's latest move comes after Russian drones violated Polish airspace

A trio of Russian MiG-31 fighter jets crossed into Estonia's airspace for approximately 12 minutes on Friday (September 19)

President Donald Trump has previously admitted how Putin has 'let him down', but now his Russian counterpart has ordered planes into Estonia

The NATO nation has described the move by Russia as 'brazen'

President Donald Trump spoke about the 'hate' Zelenskyy and Putin have for each other

President Zelenskyy has asked for clear demands from Donald Trump

Fears remain high regarding an escalation of the war in Europe

It comes after Russian drones were shot down over Poland last week

The two world leaders held peace talks in Alaska just last month

The President of the United States posted the letter on his social media site, Truth Social

The drone strike went beyond Moscow as Ukrainian officials have began to take aim at facilities deep in Russian territory

Donald Trump took to Truth Social to issue the message

Poland reported that numerous Russian drones invaded its airspace last night

Polish Prime Minister Donald Tusk confirmed that Poland had shot down Russian drones

Poland shot down Russian drones after major airspace violation overnight

Leaders from across Europe have slammed the violation which prompted NATO to respond

A number of experts have shared their thoughts on the 'meaning' behind the message

The Kremlin has addressed Donald Trump's latest threat

The Russian president has responded to the the idea of peacekeeping troops being sent to Ukraine

Vladimir Putin and Xi Jinping attended a military parade together on Wednesday

The clarification comes as Vladimir Putin is attending a military parade in Beijing

A Ukrainian brigade confirmed the attack took place on August 23 - days after Trump met with Russian President Putin

The 33-year-old was 'left for dead'