Just days after announcing its intentions to join NATO, Sweden has received full backing from the United States.

U.S. Defence Secretary Llyod Austin welcomed his Swedish counterpart to the Pentagon, in a show of solidarity between the two nations.

Austin says the United States says Sweden’s membership to the alliance will make all member nations safer and more secure.

Both Finland and Sweden formally applied to join the strategic alliance on Wednesday, but still face objections from Turkey.

The whole membership process is expected to take just a few weeks, but ratification by all allied parliaments could take up to a year.

It signifies one of the most significant shake-ups of European security architecture not seen since the Cold War.

The two nations remained neutral throughout this period in history, despite Finland sharing a 1,300 kilometre border with Russia.

Sweden says Russian propaganda can no longer hide the nation’s war crimes… and believes now more than ever, democracies must stand together against Moscow’s increasing aggression.

NATO Secretary-General Jen Stoltenberg says this is an historic moment which must be seized, warmly requesting the requests from both meetings at the alliance headquarters.

Both Sweden and Finland handed over their application letters, each envelope embossed with their national flag.