In the correspondence, Kim also expressed “strong support and solidarity to the achievement of justice held by the Syrian government and people”.
North Korea and Syria have reaffirmed efforts to step up relations in their recent exchanges of congratulatory messages on key anniversaries as the strike alarmed both countries.
Ever since President Trump warned the hermit state not to carry out nuclear tests, tension has been escalating in the region.
The message was sent to celebrate the 71st anniversary of Syria’s independence from France and was reported by the state-run Korean Central News Agency.
It follows claims, by the same news outlet, that Assad previously declared the two country’s are “waging a war against the wild ambitions of major powers, that wish to subject other nations to their expansionist policies and deprive Syria and North Korea of their right to self-determination”.
The US president warned that Pyongyang has “gotta behave” as government officials agreed to deploy a missile defence system in the region.
And asked about his next move following this weekend’s failed missile launch, Mr Trump said: “You’ll see.”
Expanding on Mr Trump’s remarks today, White House press secretary Sean Spicer said the President would not be “drawing lines in the sand” over rising tensions in the Korean peninsula.
He said: “(Mr Trump) holds his cards close to the vest.”
A State Department official said on Monday, that the US will continue trying to further isolate North Korea economically, politically and diplomatically.
Susan Thornton, the acting assistant secretary for East Asian and Pacific affairs, said: “The pressure will keep ratcheting up until Pyongyang stops conducting missile tests and demonstrates it is willing to engage in negotiations.”
Analysts believe Trump is not seeking to become embroiled in hostilities with Kim Jong-un’s regime, but to “harden” China’s position towards the reclusive state by unnerving Beijing into reining in its wayward neighbour.
As recently as Thursday, China once again attempted to play peacemaker between the US and the North Korean leader, calling on both sides to avoid a military conflict while asking the latter to curb a nuclear program that’s long been outlawed by the United Nations.