Voicing great concern over the military nexus between China and Pakistan, Defence Minister A K Antony said on Friday that India will have to be vigilant at all times.

"The nexus between China and Pakistan in the military sphere remains an area of great concern," he said speaking at the Institute of Defence Studies and Analyses (IDSA) founders' day event in the capital.

"We have to carry out continuous appraisal of Chinese military capabilities and shape our responses accordingly. At the same time, we need to be vigilant at all times," he said.

New Delhi feels the China-Pakistan military nexus is detrimental to its interests and the strategic balance in the South Asian region.

Another area of concern for India is Chinese transfer of equipment and technology for Pakistan's nuclear weapon programme. China has helped Pakistan build two nuclear reactors in the Punjab province and continues to support its nuclear programme.

China is Pakistan's largest defence supplier. These include short-range ballistic missiles, fighter aircraft, frigates with helicopters, T-85 tanks, jet trainers besides arms and ammunition.

The Defence Minister said India is hopeful that China would reciprocate to its initiatives aimed at mutual prosperity and understanding.

"India wants to develop a friendly and cordial relationship with its neighbours including China. We continue our efforts. At the same time, there are issues that are a matter of concern to us," Antony later told reporters.

The minister accused Pakistan of not taking credible steps to put an end to terror groups operating from its soil.

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