On the other hand, Pakistan's relations with Iran have been strained at times due to sectarian tensions. Iran and Saudi Arabia used Pakistan as a battleground for their proxy sectarian war, and by the 1990s Pakistan's support for the Sunni Taliban organisation in Afghanistan became a problem for Shia Iran, which opposed a Taliban-controlled Afghanistan. Tensions between Iran and Pakistan intensified in 1998 when Iran accused Pakistan of war crimes after Pakistani warplanes had bombarded Afghanistan's last Shia stronghold in support of the Taliban.