0945 GMT July 20, 2019
Operation Fath – meaning "victory" in Arabic – will be conducted across Afghanistan with the aim of "eradicating occupation" and "cleansing” the country from “invasion and corruption", the Taliban said in a statement, AFP reported.
The spring offensive traditionally marks the start of the so-called fighting season, though the announcement is largely symbolic as in recent winters the Taliban have continued fighting Afghan and US forces.
"Even as large parts of our homeland have been freed from the enemy, yet the foreign occupying forces continue exercising military and political influence” in the country, the statement said.
Qais Mangal, a spokesman for the Afghan Ministry of Defense, dismissed the Taliban's spring offensive as "mere propaganda".
"The Taliban will not reach their vicious goals and their operations will be defeated like previous years," Mangal said.
After suffering horrific bloodshed in 2018, Kabul has in recent weeks enjoyed something of a lull in violence.
But on Monday three US Marines were killed in a Taliban blast at Bagram airbase north of the city, and authorities in the capital are on high alert for new attacks.
The administration of President Ashraf Ghani recently declared its own spring offensive, Operation Khalid, and the Taliban used that announcement as a justification for launching a new push.
It shows "the enemy still seeks to attain its malicious objectives through the use of force", the Taliban said.
The US has held several rounds of talks with the Taliban in a bid to bring an end to the war against the militants.
Separately, Afghan politicians have also met with the Taliban in Moscow.
A fresh round of talks is expected to take place later this month between Afghan political leaders, including some officials from the Kabul government, and the Taliban in the Qatari capital Doha.
The Taliban have long refused to speak officially with Kabul, insisting that government officials are attending only in a "personal capacity".
Kabul-based military analyst Ateequllah Amarkhail said violence is likely to increase even as negotiations proceed.
The Taliban "want to enter the talks from the position of strength. Their operations are to challenge the government, and they want to have the upper hand," Amarkhail told AFP.
He predicted "intense" fighting for 2019, with the renewed bloodshed taking a toll on civilians.
In 2018, a record 10,993 civilians were wounded or killed in Afghanistan, according to UN figures, and several thousand Afghan police and soldiers are dying each year.
Fed up with the $45 billion annual price tag and what his military leaders termed a "stalemate", US President Donald Trump last year decided to slash the number of American soldiers in Afghanistan.
No such drawdown has happened yet and the US still has about 14,000 troops in the country, nearly 18 years after the US-led invasion to topple the Taliban.
The US and its allies invaded Afghanistan in 2001 under the guise of the war on terror. Some 18 years on, the Taliban have only boosted its campaign of violence across the country, targeting both civilians and security forces in bloody assaults.
Many Afghans are worried that in America's push for a settlement, concerns for human rights and democracy will ultimately be cast aside and the Taliban will return to power.