Pakistani prime minister Nawaz Sharif called India's Narendra Modi on Friday to congratulate him on his party's landslide general election win. Sharif also invited Modi to visit Pakistan.
A statement from Sharif's office said he spoke to Modi, leader of the Bharatiya Janata Party (BJP), to hail the "impressive victory".
Preliminary results following the five-week elections showed the BJP on course for the first parliamentary majority by a single party in 30 years. Since his own election victory in May last year, Sharif has sought to improve ties with Pakistan's giant neighbour and arch-rival.
But there have been fears that a victory for Modi could signal bumpy times ahead for the two nuclear powers.
India's outgoing Prime Minister Manmohan Singh said in January that Modi would be "disastrous for the country" after "presiding over the massacre of innocents".
Earlier, British prime minister David Cameron congratulated Modi.
"Congratulations @narendramodi on victory in India's elections. Keen to work together to get the most from UK-India relationship," Cameron tweeted Friday in his official 10, Downing Street, account.
With the BJP headed for a big majority in the Lok Sabha, Modi is set to succeed Manmohan Singh as India's 14th prime minister.
British Prime Minister David Cameron May 7 said he was "looking forward" to discussing the recent European Union (EU) ban on Indian mango imports with the country's new prime minister.
Addressing British MPs in the House of Commons, Cameron said the ban was a "serious issue" as there were concerns about possible cross-contamination and it must be made sure "that is got right".
Most of the country’s 1.2 billion people — more than half of whom are under 25 — have never witnessed such dominance having grown up in an era of fractious coalition politics.
Bangladesh PM Sheikh Hasina and opposition BNP chief Khaleda Zia also congratulated Modi.
Sri Lankan president Mahinda Rajapaksa telephoned Modi to wish him and extended an invitation to the BJP’s prime ministerial nominee to visit the island-nation.
The BJP win was welcomed in Sri Lanka as the Rajapaksa government's relations with the Congress Party led-UPA government had soured over the years.
The Congress government had backed two UN Human Rights Council resolutions against Sri Lanka while it abstained from voting during the US-backed resolution in March.
Australian PM Tony Abbott also called Modi up.
"I've spoken to @narendramodi and congratulated him on his success. I look forward to strengthening ties between India and Australia," Abbott tweeted Friday in his official PM account.
According to Radio Australia, Abbott has invited Modi to visit Australia for the G20 Summit to be held in Brisbane in November.